VULNERABILITY INTELLIGENCE

CVE-2021-40120

CVSS score6.5 MEDIUM
EPSS probability2.00%
CISA KEVNot currently listed
Published2021-11-04
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Description

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.

Weakness classification

  • psirt@cisco.com: CWE-20
  • nvd@nist.gov: CWE-78

Primary references