What is CVE-2022-20842?

CVE-2022-20842 is a critical-severity vulnerability in Cisco Small Business Rv Series Router Firmware, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.0/10. Published 2022-08-10.

How severe is CVE-2022-20842?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Buffer overflow in Cisco Small Business Rv Series Router Firmware

CVE-2022-20842

Multiple vulnerabilities in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

Vulnerability class: Buffer Overflow

Published 2022-08-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.9th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Weakness classification (CWE)

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-mult-… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2022-20842?: CVE-2022-20842 is a critical-severity vulnerability in Cisco Small Business Rv Series Router Firmware, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.0/10. Published 2022-08-10.
How severe is CVE-2022-20842?: Critical severity. CVSS v3 base score is 9.0 out of 10.