Sophos XG Firewall Buffer Overflow Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2025-02-06
• EPSS: 11% chance of exploitation in the next 30 days (higher than 96% of CVEs)
• Critical severity: CVSS 9.8

[ Description ]Official description

Sophos XG Firewall 17.x through v17.5 MR12 allows a Buffer Overflow and remote code execution via the HTTP/S Bookmarks feature for clientless access. Hotfix HF062020.1 was published for all firewalls running v17.x.

CISA: Sophos XG Firewall contains a buffer overflow vulnerability that allows for remote code execution via the "HTTP/S bookmark" feature.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 27 Feb 2025): Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• community.sophos.com/b/security-blog/posts/advisory-buffer-overflow-vulnerability-in-us…MitigationVendor Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource