Security readout for executives and security teams
Plain-English summary
ZoomSounds before 6.05 could let an unauthenticated internet user upload arbitrary files to the web server. In business terms, exposed sites may face site takeover, data exposure, or malicious content placement. The source bundle does not show confirmed active exploitation.
Executive priority
Prioritize within the emergency patch window for any internet-facing instance. The vulnerability is unauthenticated, low-complexity, and can affect confidentiality and integrity, which makes it a credible site-compromise risk even without confirmed active exploitation evidence.
Technical view
CVE-2021-4457 is a CWE-434 arbitrary file upload flaw in a PHP file within ZoomSounds before 6.05. CVSS 3.1 is 9.1 with network access, low complexity, no privileges, and no user interaction required. The record indicates high confidentiality and integrity impact, with no availability impact scored.
Likely exposure
Exposure is most likely on internet-facing websites running ZoomSounds versions before 6.05. The affected-product metadata is sparse, so asset owners should verify plugin presence and exact version from their own inventories.
Exploitation context
The WPScan reference is tagged as exploit, but the source bundle does not include CISA KEV status or cited evidence of active exploitation. Treat this as highly urgent because unauthenticated file upload vulnerabilities are commonly useful for server compromise.
Researcher notes
The bundle’s affected metadata lists vendor as unknown and versions as 0, while the description and title identify ZoomSounds before 6.05. Base analysis on confirmed local deployments. Do not infer broader product scope without vendor or WPScan confirmation.
Mitigation direction
- Upgrade ZoomSounds to version 6.05 or later if vendor guidance confirms it fixes the issue.
- If upgrade status is uncertain, check vendor or WPScan guidance before assuming remediation.
- Remove or disable unused ZoomSounds installations from public sites.
- Review web server write permissions for plugin and upload paths.
- Investigate unexpected files in web-accessible directories.
Validation and detection
- Inventory public websites for ZoomSounds and record installed versions.
- Confirm whether any instance is below version 6.05.
- Review web server logs for unauthenticated upload activity around the plugin.
- Check web-accessible directories for newly created or suspicious files.
- Verify remediation by confirming the vulnerable version is no longer present.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-434: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-4457 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N3.95.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://wpscan.com/vulnerability/07259a61-8ba9-4dd0-8d52-cc1df389c0adCVE reference · exploit, vdb-entry
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.