CVE‑2020‑15069: Sophos XG Firewall Buffer Overflow Allows Remote Code Execution
What It Is – A buffer‑overflow flaw in the Sophos XG Firewall’s “HTTP/S bookmark” feature can be triggered remotely to execute arbitrary code on the firewall appliance.
Exploitability – The vulnerability is listed in CISA’s Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation in the wild. CVSS v3.1 base score 9.8 (Critical).
Affected Products – Sophos XG Firewall (all versions prior to the vendor‑released patch in 2020).
Why It Matters for Trust & Control Assurance
- Demonstrates the need for a robust vulnerability‑management program that continuously inventories, scans, and patches critical network devices.
- Provides auditors with concrete evidence that the organization monitors and remediates high‑severity flaws, supporting a defensible audit trail.
- Highlights the importance of continuous control monitoring to prove due‑diligence in protecting the confidentiality, integrity, and availability of network perimeters.
Recommended Actions
- Apply the Sophos‑released patch immediately; verify the installed version via the firewall’s management console.
- Update your asset inventory to flag all XG Firewall instances and confirm they are covered by your vulnerability‑management schedule.
- Enable detailed logging for the HTTP/S bookmark feature and integrate logs into a SIEM for real‑time detection of anomalous activity.
- Conduct a post‑patch validation scan to ensure the flaw is fully mitigated.
Source: CISA KEV – CVE‑2020‑15069