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CVE Record

CVE-2021-1344: Cisco Small Business RV Series Routers Management Interface Remote Command Execution and Denial of Service Vulnerabilities

Multiple vulnerabilities in the web-based management interface of Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 Routers could allow an authenticated, remote attacker to execute arbitrary code or cause an affected device to restart unexpectedly. These vulnerabilities are due to improper validation of user-supplied input in the web-based management interface. An attacker could exploit these vulnerabilities by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system or cause the device to reload, resulting in a denial of service (DoS) condition. To exploit these vulnerabilities, an attacker would need to have valid administrator credentials on the affected device.

HighCVSS 7.2Not KEV-listedUpdated
Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This vulnerability affects several Cisco Small Business RV routers. An attacker who already has valid administrator credentials could abuse the web management interface to run code as root or force the router to restart, disrupting connectivity.

Executive priority

Treat this as high priority for small business network edge devices. The credential requirement reduces likelihood, but root-level execution and router reloads can affect confidentiality, integrity, and availability at a network boundary.

Technical view

CVE-2021-1344 is an authenticated remote command execution and denial-of-service issue in Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 router firmware. Cisco attributes it to improper validation of user-supplied input in crafted HTTP requests to the web management interface. The listed CWE is CWE-121.

Likely exposure

Exposure is most likely where affected RV Series routers are still deployed, their web management interface is reachable, and administrator credentials are compromised or misused. The bundle does not identify specific affected firmware versions.

Exploitation context

The source bundle does not report active exploitation, and KEV status is false. Exploitation requires valid administrator credentials and crafted HTTP requests to the management interface. Successful exploitation may provide root-level code execution or cause a reload-based denial of service.

Researcher notes

The CVSS 3.1 score is 7.2 with AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. Evidence supports authenticated remote exploitation through the web management interface, but the bundle does not provide exploit status, fixed versions, or detailed workaround text.

Mitigation direction

  • Check Cisco’s advisory for fixed firmware, official workarounds, and product-specific guidance.
  • Inventory Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers.
  • Restrict web management access to trusted administrative networks only.
  • Review and rotate administrator credentials for affected devices.
  • Plan replacement if vendor-supported fixes are unavailable for deployed hardware.

Validation and detection

  • Identify deployed router models and firmware versions from asset records or management consoles.
  • Confirm whether the web management interface is reachable from untrusted networks.
  • Review administrator account lists for stale, shared, or unexpected accounts.
  • Check device logs for unexpected administrative access or unexplained reloads.
  • Compare findings against Cisco’s advisory before declaring systems remediated.
Prepared
Confidence
high
Sources
3

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

CWE-121: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookup
description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-1344 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.2 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
7.2CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H1.25.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.2High
CVSS 3.1 vector shape for CVE-2021-1344Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone
Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco Small Business RV Series Router Firmwaren/aListed
Weakness

CWE details

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-121 · source CWE mapping

Stack-based Buffer Overflow

Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.