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CVE archive

2021 CVE Archive

Browse CVE records published in 2021 CVE Archive, with severity, affected products, CWE, KEV, and source-backed vulnerability context.

Showing 50 of 22586 matching CVEs · Page 7 of 452.

Medium · CVSS 6.4

CVE-2021-47907: Rocket LMS 1.1 Persistent Cross-Site Scripting via Support Tickets

Rocket LMS 1.1 contains a persistent cross-site scripting vulnerability in the support ticket module that allows authenticated users to inject malicious script code through the title parameter. Attackers can submit support tickets with embedded HTML/JavaScript payloads that execute in the browsers of other users viewing the message history, enabling session hijacking and phishing attacks.

Published May 10, 2026 · Updated May 24, 2026

Medium · CVSS 6.1

CVE-2021-47836: Markdown Explorer 0.1.1 - Persistent Cross-Site Scripting

Markdown Explorer 0.1.1 contains a cross-site scripting vulnerability that allows attackers to inject malicious code through file uploads and editor inputs. Attackers can upload markdown files with embedded JavaScript payloads to execute remote commands and potentially gain system access.

Published Jan 16, 2026 · Updated May 24, 2026

Medium · CVSS 5.4

CVE-2021-47817: OpenEMR 5.0.2.1 - Remote Code Execution

OpenEMR 5.0.2.1 contains a cross-site scripting vulnerability that allows authenticated attackers to inject malicious JavaScript through user profile parameters. Attackers can exploit the vulnerability by crafting a malicious payload to download and execute a web shell, enabling remote command execution on the vulnerable OpenEMR instance.

Published Jan 21, 2026 · Updated May 24, 2026

Medium · CVSS 6.1

CVE-2021-47750: YouPHPTube <= 7.8 - Cross-Site Scripting

YouPHPTube <= 7.8 contains a cross-site scripting vulnerability that allows attackers to inject malicious scripts through the redirectUri parameter in the signup page. Attackers can craft special signup URLs with embedded script tags to execute arbitrary JavaScript in victims' browsers when they access the signup page.

Published Jan 13, 2026 · Updated May 24, 2026

Medium · CVSS 6.9

CVE-2021-47715: Hasura GraphQL 1.3.3 Server-Side Request Forgery via Remote Schema Injection

Hasura GraphQL 1.3.3 contains a server-side request forgery vulnerability that allows attackers to inject arbitrary remote schema URLs through the add_remote_schema endpoint. Attackers can exploit the vulnerability by sending crafted POST requests to the /v1/query endpoint with malicious URL definitions to potentially access internal network resources.

Published Dec 22, 2025 · Updated May 24, 2026

Unknown · CVSS Not scored

CVE-2021-46917: dmaengine: idxd: fix wq cleanup of WQCFG registers

In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix wq cleanup of WQCFG registers A pre-release silicon erratum workaround where wq reset does not clear WQCFG registers was leaked into upstream code. Use wq reset command instead of blasting the MMIO region. This also address an issue where we clobber registers in future devices.

Published Feb 27, 2024 · Updated May 23, 2026

Unknown · CVSS Not scored

CVE-2021-46905: net: hso: fix NULL-deref on disconnect regression

In the Linux kernel, the following vulnerability has been resolved: net: hso: fix NULL-deref on disconnect regression Commit 8a12f8836145 ("net: hso: fix null-ptr-deref during tty device unregistration") fixed the racy minor allocation reported by syzbot, but introduced an unconditional NULL-pointer dereference on every disconnect instead. Specifically, the serial device table must no longer be accessed after the minor has been released by hso_serial_tty_unregister().

Published Feb 25, 2024 · Updated May 23, 2026

Unknown · CVSS Not scored

CVE-2021-4454: can: j1939: fix errant WARN_ON_ONCE in j1939_session_deactivate

In the Linux kernel, the following vulnerability has been resolved: can: j1939: fix errant WARN_ON_ONCE in j1939_session_deactivate The conclusion "j1939_session_deactivate() should be called with a session ref-count of at least 2" is incorrect. In some concurrent scenarios, j1939_session_deactivate can be called with the session ref-count less than 2. But there is not any problem because it will check the session active state before session putting in j1939_session_deactivate_locked(). Here is the concurrent scenario of the problem reported by syzbot and my reproduction log. cpu0 cpu1 j1939_xtp_rx_eoma j1939_xtp_rx_abort_one j1939_session_get_by_addr [kref == 2] j1939_session_get_by_addr [kref == 3] j1939_session_deactivate [kref == 2] j1939_session_put [kref == 1] j1939_session_completed j1939_session_deactivate WARN_ON_ONCE(kref < 2) ===================================================== WARNING: CPU: 1 PID: 21 at net/can/j1939/transport.c:1088 j1939_session_deactivate+0x5f/0x70 CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 5.14.0-rc7+ #32 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014 RIP: 0010:j1939_session_deactivate+0x5f/0x70 Call Trace: j1939_session_deactivate_activate_next+0x11/0x28 j1939_xtp_rx_eoma+0x12a/0x180 j1939_tp_recv+0x4a2/0x510 j1939_can_recv+0x226/0x380 can_rcv_filter+0xf8/0x220 can_receive+0x102/0x220 ? process_backlog+0xf0/0x2c0 can_rcv+0x53/0xf0 __netif_receive_skb_one_core+0x67/0x90 ? process_backlog+0x97/0x2c0 __netif_receive_skb+0x22/0x80

Published Mar 27, 2025 · Updated May 23, 2026

Medium · CVSS 6.7

CVE-2021-21508: Dell VxRail versions before 7.0.200 contain a Plain-text Password Storage Vulnerability in VxRail Manager.

Dell VxRail versions before 7.0.200 contain a Plain-text Password Storage Vulnerability in VxRail Manager. A sys-admin user may exploit this vulnerability, leading to the disclosure of certain user credentials. The attacker may be able to use the exposed credentials to access the vulnerable application with privileges of the compromised account.

Published May 22, 2026 · Updated May 22, 2026

High · CVSS 8.7

CVE-2021-47942: Home Assistant Community Store 1.10.0 Path Traversal Account Takeover

Home Assistant Community Store (HACS) 1.10.0 contains a path traversal vulnerability that allows unauthenticated attackers to read sensitive files by traversing directories via the /hacsfiles/ endpoint. Attackers can retrieve the .storage/auth file containing user credentials and refresh tokens, then craft valid JWT tokens to gain administrative access to Home Assistant instances.

Published May 16, 2026 · Updated May 18, 2026

High · CVSS 8.7

CVE-2021-47969: Color Notes 1.4 Denial of Service via Long Character String

Color Notes 1.4 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings into note fields. Attackers can generate a payload containing 350,000 repeated characters and paste it twice into a new note to cause the application to stop responding.

Published May 16, 2026 · Updated May 18, 2026

High · CVSS 8.7

CVE-2021-47977: WordPress Anti-Malware Security Bruteforce Firewall 4.20.59 Directory Traversal

WordPress Plugin Anti-Malware Security and Bruteforce Firewall 4.20.59 contains a directory traversal vulnerability that allows unauthenticated attackers to read arbitrary files by manipulating the file parameter. Attackers can send requests to the duplicator_download action via admin-ajax.php with path traversal sequences to access sensitive system files outside the intended directory.

Published May 16, 2026 · Updated May 18, 2026

High · CVSS 8.7

CVE-2021-47971: My Notes Safe 5.3 Denial of Service via Buffer Overflow

My Notes Safe 5.3 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings into note fields. Attackers can generate a payload containing 350000 repeated characters and paste it twice into a new note to trigger an application crash.

Published May 16, 2026 · Updated May 18, 2026

High · CVSS 8.8

CVE-2021-47954: LayerBB 1.1.4 SQL Injection via search_query Parameter

LayerBB 1.1.4 contains an SQL injection vulnerability that allows unauthenticated attackers to manipulate database queries by injecting SQL code through the search_query parameter. Attackers can send POST requests to /search.php with malicious search_query values using CASE WHEN statements to extract sensitive database information.

Published May 16, 2026 · Updated May 18, 2026

High · CVSS 8.7

CVE-2021-47972: Sticky Notes & Color Widgets 1.4.2 Denial of Service

Sticky Notes & Color Widgets 1.4.2 contains a denial of service vulnerability that allows attackers to crash the application by creating notes with excessively long character strings. Attackers can paste large payloads of repeated characters into note fields to trigger application crashes and make the application stop responding.

Published May 16, 2026 · Updated May 18, 2026

Medium · CVSS 6.9

CVE-2021-47978: ProcessMaker 3.5.4 Local File Inclusion via Path Traversal

ProcessMaker 3.5.4 contains a local file inclusion vulnerability that allows unauthenticated attackers to read arbitrary files by exploiting improper path traversal validation. Attackers can send requests with directory traversal sequences to access sensitive system files like /etc/passwd without authentication.

Published May 16, 2026 · Updated May 18, 2026

High · CVSS 8.7

CVE-2021-47970: Macaron Notes 5.5 Denial of Service via Buffer Overflow

Macaron Notes 5.5 contains a denial of service vulnerability that allows attackers to crash the application by creating notes with excessively long character strings. Attackers can generate a payload containing 350000 repeated characters and paste it into a note field to trigger application crash and stop functionality.

Published May 16, 2026 · Updated May 18, 2026

High · CVSS 8.8

CVE-2021-47976: TextPattern CMS 4.9.0-dev Authenticated Remote Code Execution via Plugin Upload

TextPattern CMS 4.9.0-dev contains a remote code execution vulnerability that allows authenticated attackers to upload arbitrary PHP files by exploiting the plugin upload functionality. Attackers can authenticate, retrieve a CSRF token from the plugin event page, and upload malicious PHP files to the textpattern/tmp/ directory for code execution.

Published May 16, 2026 · Updated May 18, 2026

High · CVSS 8.8

CVE-2021-47964: Schlix CMS 2.2.6-6 Remote Code Execution via core.blockmanager

Schlix CMS 2.2.6-6 contains a remote code execution vulnerability that allows authenticated attackers to execute arbitrary PHP code by uploading malicious extension packages through the block manager. Attackers can upload a crafted ZIP file containing PHP code in the packageinfo.inc file and trigger execution by accessing the About tab of the installed extension.

Published May 15, 2026 · Updated May 18, 2026

High · CVSS 8.5

CVE-2021-47974: VX Search 13.5.28 Unquoted Service Path Privilege Escalation

VX Search 13.5.28 contains an unquoted service path vulnerability in both VX Search Server and VX Search Enterprise services that allows local attackers to escalate privileges. Attackers can place malicious executables in unquoted path directories like C:\Program Files\VX Search to execute arbitrary code with LocalSystem privileges when services restart.

Published May 16, 2026 · Updated May 18, 2026

High · CVSS 7.1

CVE-2021-47980: Fuel CMS 1.4.13 Blind SQL Injection via col Parameter

Fuel CMS 1.4.13 contains a blind SQL injection vulnerability that allows authenticated attackers to manipulate database queries by injecting SQL code through the 'col' parameter in the Activity Log interface. Attackers can send requests to the logs endpoint with malicious SQL payloads in the 'col' parameter to extract database information based on response time delays.

Published May 16, 2026 · Updated May 18, 2026

Medium · CVSS 6.9

CVE-2021-47934: MyBB Timeline Plugin 1.0 Cross-Site Scripting and CSRF

MyBB Timeline Plugin 1.0 contains cross-site scripting vulnerabilities that allow attackers to inject malicious scripts through thread titles, post content, and user profile fields like Location and Bio. Attackers can also exploit a cross-site request forgery vulnerability in the timeline.php profile action to change a user's cover picture by crafting malicious forms that execute when victims visit affected profiles.

Published May 16, 2026 · Updated May 18, 2026

High · CVSS 8.8

CVE-2021-47956: EgavilanMedia PHPCRUD 1.0 SQL Injection via firstname

EgavilanMedia PHPCRUD 1.0 contains an SQL injection vulnerability that allows unauthenticated attackers to manipulate database queries by injecting SQL code through the firstname parameter. Attackers can send POST requests to insert.php with malicious firstname values to extract sensitive database information.

Published May 16, 2026 · Updated May 18, 2026

High · CVSS 8.7

CVE-2021-47973: Sticky Notes Widget 3.0.6 Denial of Service via Buffer Overflow

Sticky Notes Widget 3.0.6 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings into note fields. Attackers can generate a payload containing 350000 repeated characters and paste it twice into a new note to trigger an application crash on iOS devices.

Published May 16, 2026 · Updated May 18, 2026

Medium · CVSS 6.1

CVE-2021-4195: XSS in Firmanet Software and Technology Customer Relation Manager

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Firmanet Software and Technology Customer Relation Manager allows XSS Targeting HTML Attributes. This issue affects Customer Relation Manager: before 2022.03.13.

Published Mar 14, 2023 · Updated May 18, 2026

Medium · CVSS 6.5

CVE-2021-45478: IDOR in Yordam Library Automation System

Improper Handling of Parameters vulnerability in Bordam Information Technologies Library Automation System allows Collect Data as Provided by Users. This issue affects Library Automation System: before 19.2.

Published Mar 2, 2023 · Updated May 18, 2026

Medium · CVSS 5.4

CVE-2021-45479: XSS in Yordam Library Automation System

Improper Neutralization of Input During Web Page Generation vulnerability in Yordam Information Technologies Library Automation System allows Stored XSS. This issue affects Library Automation System: before 19.2.

Published Mar 2, 2023 · Updated May 18, 2026

Medium · CVSS 6.5

CVE-2021-45477: IDOR in Yordam Library Automation System

Improper Handling of Parameters vulnerability in Bordam Information Technologies Library Automation System allows Collect Data as Provided by Users. This issue affects Library Automation System: before 19.2.

Published Mar 2, 2023 · Updated May 18, 2026

High · CVSS 8.6

CVE-2021-44793: Information Leakege via Unauthorized Access in Single Connect

Single Connect does not perform an authorization check when using the sc-reports-ui" module. A remote attacker could exploit this vulnerability to access the device configuration page and export the data to an external file. The exploitation of this vulnerability might allow a remote attacker to obtain sensitive information including the database credentials. Since the database runs with high privileges it is possible to execute commands with the attained credentials.

Published Jan 27, 2022 · Updated May 18, 2026

Medium · CVSS 5.3

CVE-2021-44794: Information Leakege via Unauthorized Access in Single Connect

Single Connect does not perform an authorization check when using the "sc-diagnostic-ui" module. A remote attacker could exploit this vulnerability to access the device information page. The exploitation of this vulnerability might allow a remote attacker to obtain sensitive information.

Published Jan 27, 2022 · Updated May 18, 2026

Medium · CVSS 5.3

CVE-2021-44795: Modifying User Permissions via Unauthorized Access in Single Connect

Single Connect does not perform an authorization check when using the "sc-assigned-credential-ui" module. A remote attacker could exploit this vulnerability to modify users permissions. The exploitation of this vulnerability might allow a remote attacker to delete permissions from other users without authenticating.

Published Jan 27, 2022 · Updated May 18, 2026

Medium · CVSS 5.3

CVE-2021-44792: Information Leakege via Unauthorized Access in Single Connect

Single Connect does not perform an authorization check when using the "log-monitor" module. A remote attacker could exploit this vulnerability to access the logging interface. The exploitation of this vulnerability might allow a remote attacker to obtain sensitive information.

Published Jan 27, 2022 · Updated May 18, 2026

High · CVSS 8.8

CVE-2021-3855: Command Injection in Liman Central Management System

Improper Neutralization of Special Elements used in a Command ('Command Injection') vulnerability in Liman Central Management System Liman MYS (HTTP/Controllers, CronMail, Jobs modules) allows Command Injection. This issue affects Liman Central Management System: from 1.7.0 before 1.8.3-462.

Published Feb 24, 2023 · Updated May 18, 2026

Critical · CVSS 9.8

CVE-2021-3854: SQLi in Glox Technology's Useroam Hotspot

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Glox Technology Useroam Hotspot allows SQL Injection. This issue affects Useroam Hotspot: before 5.1.0.15.

Published Mar 2, 2023 · Updated May 18, 2026

Critical · CVSS 9.6

CVE-2021-3825: Missing Authorization Checks in LiderAhenk

On 2.1.15 version and below of Lider module in LiderAhenk software is leaking it's configurations via an unsecured API. An attacker with an access to the configurations API could get valid LDAP credentials.

Published Oct 1, 2021 · Updated May 18, 2026

Medium · CVSS 5.3

CVE-2021-3806: Path Traversal in Pardus Software Center

A path traversal vulnerability on Pardus Software Center's "extractArchive" function could allow anyone on the same network to do a man-in-the-middle and write files on the system.

Published Sep 18, 2021 · Updated May 18, 2026

Medium · CVSS 5.3

CVE-2021-47958: CouchCMS 2.2.1 Server-Side Request Forgery via SVG upload

CouchCMS 2.2.1 contains a server-side request forgery vulnerability that allows authenticated attackers to make arbitrary HTTP requests by uploading malicious SVG files. Attackers can upload SVG files containing external entity references through the browse.php endpoint to access internal services and resources.

Published May 15, 2026 · Updated May 15, 2026

High · CVSS 8.8

CVE-2021-47966: PHP Timeclock 1.04 SQL Injection via login.php

PHP Timeclock 1.04 contains time-based and boolean-based blind SQL injection vulnerabilities in the login_userid parameter of login.php that allows unauthenticated attackers to extract database contents. Attackers can submit crafted POST requests with SQL payloads using SLEEP functions or RLIKE conditional statements to dump sensitive database information including employee names and credentials.

Published May 15, 2026 · Updated May 15, 2026

High · CVSS 8.7

CVE-2021-47959: WordPress Plugin WPGraphQL 1.3.5 Denial of Service

WordPress Plugin WPGraphQL 1.3.5 contains a denial of service vulnerability that allows unauthenticated attackers to exhaust server resources by sending batched GraphQL queries with duplicated fields. Attackers can send POST requests to the GraphQL endpoint with amplified field duplication payloads to trigger server out-of-memory conditions and MySQL connection errors.

Published May 15, 2026 · Updated May 15, 2026

Critical · CVSS 9.8

CVE-2021-47965: WordPress Plugin WP Super Edit 2.5.4 Unrestricted File Upload

WordPress Plugin WP Super Edit 2.5.4 and earlier contains an unrestricted file upload vulnerability in the FCKeditor component that allows attackers to upload dangerous file types without validation. Attackers can upload arbitrary files through the filemanager upload endpoint to achieve remote code execution and complete system compromise.

Published May 15, 2026 · Updated May 15, 2026

High · CVSS 7.5

CVE-2021-47751: CuteEditor for PHP 6.6 - Directory Traversal

CuteEditor for PHP (now referred to as Rich Text Editor) 6.6 contains a directory traversal vulnerability in the browse template feature that allows attackers to write files to arbitrary web root directories. Attackers can exploit the ServerMapPath() function by renaming uploaded HTML files using directory traversal sequences to write files outside the intended template directory.

Published Jan 13, 2026 · Updated May 14, 2026

High · CVSS 8.7

CVE-2021-47749: YouPHPTube <= 7.8 - Directory Traversal

YouPHPTube <= 7.8 contains a local file inclusion vulnerability that allows unauthenticated attackers to access arbitrary files by manipulating the 'lang' parameter in GET requests. Attackers can exploit the path traversal flaw in locale/function.php to include and view PHP files outside the intended directory by using directory traversal sequences.

Published Jan 13, 2026 · Updated May 14, 2026