CVE-2021-25268 Cross-site scripting in Sophos Firewall

What is CVE-2021-25268?

CVE-2021-25268 is a high-severity cross-site scripting vulnerability in Sophos Firewall, published on 5 May 2022. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official description

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

Weakness: CWE-79

Which versions are affected by CVE-2021-25268?

It affects 1 product.

Products include Sophos Firewall Firmware.

How do I fix CVE-2021-25268?

No fix has been published for CVE-2021-25268 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-25268 being exploited?

There is no known exploitation of CVE-2021-25268 in the wild and no public exploit code.

Other vulnerabilities in Sophos Firewall

• CVE-2025-6704 Command injection in Sophos Firewall Critical 9.8
• CVE-2025-7624 SQL injection in Sophos Firewall Critical 9.8
• CVE-2024-12727 SQL injection in Sophos Firewall Critical 9.8
• CVE-2024-12728 Hardcoded credentials in Sophos Firewall Critical 9.8
• CVE-2025-7382 Command injection in Sophos Firewall High 8.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-6gw9-fj88-98q3.