Cisco Small Business RV Series Routers Stack-based Buffer Overflow Vulnerability

What it is

A vulnerability 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, or cause a denial of service (DoS).

Who's affected

Affects anyone with Cisco networking or security appliances on their network — typically a firewall, switch, or remote-access VPN. That device controls traffic to and from every workstation; exploitation can mean an attacker pivots inside the network without touching any user device.

What to do

Apply updates per vendor instructions.

If you don't have someone in-house to verify the patch deployed across every endpoint — or you're not sure whether you're affected — that's exactly the kind of triage we do. Book a free 20-minute triage call.

CISA due date

Federal deadline: March 17, 2022. Federal agencies must complete the required action by this date. For private SMBs the deadline is advisory — but treat it as a strong recommendation, especially if you handle regulated data (HIPAA, GLBA, ABA model rules).

EPSS

EPSS score: 72.5% — higher than 99% of all scored CVEs.

EPSS estimates the probability of exploitation activity in the next 30 days. Every entry on this site is already confirmed exploited, so read it as relative urgency among the things you still have open, not as permission to wait.

Score dated 2026-08-12, from the FIRST.org Exploit Prediction Scoring System.

Other exploited Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers entries

More CISA KEV entries for Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers. Same product line, same actively-exploited status.

• CVE-2022-20708: Cisco Small Business RV Series Routers Stack-based Buffer Overflow Vulnerability
• CVE-2022-20700: Cisco Small Business RV Series Routers Stack-based Buffer Overflow Vulnerability
• CVE-2022-20703: Cisco Small Business RV Series Routers Stack-based Buffer Overflow Vulnerability
• CVE-2022-20701: Cisco Small Business RV Series Routers Stack-based Buffer Overflow Vulnerability

Browse more

• All Cisco KEV entries
• Firewalls & edge
• All SMB-relevant KEV entries

Source

This entry comes from CISA's Known Exploited Vulnerabilities catalog, public US-Government data we pull daily. The plain-language framing and the what-to-do guidance above are ours. View the original entry on cisa.gov.