What’s Vulnerable › Vulnerabilities

CVE-2020-15069: Sophos XG Firewall Buffer Overflow Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-02-06
• EPSS: 10.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-29 · updated 2026-06-17
• Weakness: CWE-120

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.

Affected products

• Sophos Xg Firewall Firmware: from 17.0 before 17.5; 17.5, 17.5-maintenance_release1, 17.5-maintenance_release10, 17.5-maintenance_release11, 17.5-maintenance_release12, 17.5-maintenance_release3 (+6) — fixed in 17.5

How to fix

Upgrade to a fixed version: Sophos Xg Firewall Firmware 17.5. Check the vendor advisory for mitigations.

References

• https://community.sophos.com/b/security-blog/posts/advisory-buffer-overflow-vulnerability-in-user-portal
• https://community.sophos.com/b/security-blog/posts/advisory-buffer-overflow-vulnerability-in-user-portal
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-15069

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