CVE-2021-1602: Cisco Small Business RV160 and RV260 Series VPN Routers Remote Command Execution Vulnerability

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-04 · updated 2026-06-17
Weakness: CWE-78

Description

A vulnerability in the web-based management interface of Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. This vulnerability is due to insufficient user input validation. An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface. A successful exploit could allow the attacker to execute arbitrary commands on an affected device using root-level privileges. Due to the nature of the vulnerability, only commands without parameters can be executed.

Affected products

Cisco Small Business RV Series Router Firmware: before 1.0.01.04 — fixed in 1.0.01.04

How to fix

Upgrade to a fixed version: Cisco Small Business RV Series Router Firmware 1.0.01.04. Check the vendor advisory for mitigations.

References

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