What is CVE-2021-20120?

CVE-2021-20120 is a high-severity vulnerability in Commscope Arris Surfboard Sb8200, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2021-10-21.

How severe is CVE-2021-20120?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in Commscope Arris Surfboard Sb8200

CVE-2021-20120

The administration web interface for the Arris Surfboard SB8200 lacks any protections against cross-site request forgery attacks. This means that an attacker could make configuration changes (such as changing the administrative password) without the consent of the user.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-10-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (44.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Commscope Arris Surfboard Sb8200
Commscope Arris Surfboard Sb8200 Firmware — versions ab01.02.053.01_112320_193.0a.nsh
Arris Surfboard Sb8200 — versions AB01.02.053.01_112320_193.0A.NSH

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

www.tenable.com/security/research/tra-2021-45 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-20120?: CVE-2021-20120 is a high-severity vulnerability in Commscope Arris Surfboard Sb8200, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2021-10-21.
How severe is CVE-2021-20120?: High severity. CVSS v3 base score is 8.8 out of 10.