What is CVE-2021-25267?

CVE-2021-25267 is a medium-severity vulnerability in Sophos Firewall, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2022-05-05.

How severe is CVE-2021-25267?

Medium severity. CVSS v3 base score is 6.8 out of 10.

XSS in Sophos Firewall

CVE-2021-25267

Multiple XSS vulnerabilities in Webadmin allow for privilege escalation from admin to super-admin in Sophos Firewall older than version 19.0 GA.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-05-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (64.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.sophos.com/en-us/security-advisories/sophos-sa-20220505-sfos-19-0-0 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-25267?: CVE-2021-25267 is a medium-severity vulnerability in Sophos Firewall, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2022-05-05.
How severe is CVE-2021-25267?: Medium severity. CVSS v3 base score is 6.8 out of 10.