CVE-2022-20703: Cisco Small Business RV Series Routers Stack-based Buffer Overflow Vulnerability

Vulnerability summary

CVE-2022-20703 is a critical (CVSS 10.0) Stack-based Buffer Overflow vulnerability in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers. It is known to be exploited: CISA lists it, first on 03-03-2022. EPSS estimates a 9.20% chance of exploitation in the next 30 days, higher than 95.2% of scored vulnerabilities.

Timeline

1. 10-02-2022
   PublishedVulnerability first disclosed.
2. 03-03-2022
   Added to CISA KEVCisco Small Business RV Series Routers Stack-based Buffer Overflow Vulnerability
3. 17-03-2022
   CISA remediation dueApply updates per vendor instructions.
4. 21-10-2025
   Last modifiedVulnerability information updated.

Description

Multiple vulnerabilities in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an attacker to do any of the following: Execute arbitrary code Elevate privileges Execute arbitrary commands Bypass authentication and authorization protections Fetch and run unsigned software Cause denial of service (DoS) For more information about these vulnerabilities, see the Details section of this advisory.

• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
• CWE-295Improper Certificate ValidationThe product does not validate, or incorrectly validates, a certificate.