What is CVE-2021-25268?

CVE-2021-25268 is a high-severity vulnerability in Sophos Firewall, classified under Cross-site Scripting. CVSS score: 8.4/10. Published 2022-05-05.

How severe is CVE-2021-25268?

High severity. CVSS v3 base score is 8.4 out of 10.

XSS in Sophos Firewall

CVE-2021-25268

Multiple XSS vulnerabilities in Webadmin allow for privilege escalation from MySophos admin to SFOS 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 8.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · 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 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-25268?: CVE-2021-25268 is a high-severity vulnerability in Sophos Firewall, classified under Cross-site Scripting. CVSS score: 8.4/10. Published 2022-05-05.
How severe is CVE-2021-25268?: High severity. CVSS v3 base score is 8.4 out of 10.