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TI-2021-17315 Aliases CVE-2021-40120GHSA-f2p2-qfcm-69wm

Cisco Small Business RV Series Routers Command Injection Vulnerability

Priority LOW 38CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-78.

Summary

A vulnerability in the web-based management interface of certain Cisco Small Business RV Series Routers could allow an authenticated, remote attacker with administrative privileges to inject arbitrary commands into the underlying operating system and execute them using root-level privileges. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending malicious input to a specific field in the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying Linux operating system as a user with root-level privileges.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01999 80th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco Small Business RV Series Router Firmwareall versions—No fix listedCNA
  • Cisco Small Business RV Series Router Firmware VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios_xr:4.2.3.06:*:*:*:*:*:*:*4.2.3.06VulnerableCisco
cpe:2.3:h:cisco:rv016:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:rv042:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:rv042g:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:rv082:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:rv320:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:rv325:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:a:cisco:application_extension_platform:1.5.1.13:*:*:*:*:*:*:*1.5.1.13VulnerableCisco
  • cpe:2.3:o:cisco:ios_xr:4.2.3.06:*:*:*:*:*:*:* Versions 4.2.3.06 Vulnerable ·Cisco
  • cpe:2.3:h:cisco:rv016:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:rv042:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:rv042g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:rv082:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:rv320:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:rv325:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:a:cisco:application_extension_platform:1.5.1.13:*:*:*:*:*:*:* Versions 1.5.1.13 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-40120
  2. 2026-10-03 Alias added: GHSA-f2p2-qfcm-69wm

References

Advisory 1

  • TI-2021-13729 Stack-based buffer overflow in Cisco Small Business RV Series Router Firmware CVSS 3.1CRITICAL 9.8
  • TI-2021-00894 Stack-based buffer overflow in Cisco Small Business RV Series Router Firmware CVSS 3.1HIGH 7.2
  • TI-2021-00939 Stack-based buffer overflow in Cisco Small Business RV Series Router Firmware CVSS 3.1HIGH 7.2
  • TI-2021-00922 Stack-based buffer overflow in Cisco Small Business RV Series Router Firmware CVSS 3.1HIGH 7.2
  • TI-2021-00921 Stack-based buffer overflow in Cisco Small Business RV Series Router Firmware CVSS 3.1HIGH 7.2
  • TI-2021-00913 Stack-based buffer overflow in Cisco Small Business RV Series Router Firmware CVSS 3.1HIGH 7.2
See all 78 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences