What is CVE-2021-1610?

CVE-2021-1610 is a critical-severity vulnerability in Cisco Small Business Rv Series Router Firmware, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2021-08-04.

How severe is CVE-2021-1610?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Cisco Small Business Rv Series Router Firmware

CVE-2021-1610

Multiple vulnerabilities in the web-based management interface of the Cisco Small Business RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an attacker to do the following: Execute arbitrary code Cause a denial of service (DoS) condition Execute arbitrary commands For more information about these vulnerabilities, see the Details section of this advisory.

Vulnerability class: Buffer Overflow

Published 2021-08-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.091 (95.3th percentile), scored 2026-10-23.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.091 · newest: 0.091 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rv340-cm… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-1610?: CVE-2021-1610 is a critical-severity vulnerability in Cisco Small Business Rv Series Router Firmware, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2021-08-04.
How severe is CVE-2021-1610?: Critical severity. CVSS v3 base score is 9.8 out of 10.