Sophos XG Firewall Buffer Overflow Vulnerability
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.
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 4 / 5
- KEV catalog (CISA)06 Feb 2025
- Exploited in EUVD (ENISA)06 Feb 2025
- Used by ransomwareno
- EPSS above 10 %10.7%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Affected products
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
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EPSS peak: 10.7%
References
Other exploited vulnerabilities from the same vendor
- CVE-2020-29574CyberoamOS (CROS) SQL Injection Vulnerability6.5 · Background exploitation
- CVE-2023-1671Sophos Web Appliance Command Injection Vulnerability9.3 · Background exploitation
- CVE-2022-3236Sophos Firewall Code Injection Vulnerability9.3 · Background exploitation
- CVE-2022-1040Sophos Firewall Authentication Bypass Vulnerability9.3 · Background exploitation
- CVE-2020-25223Sophos SG UTM Remote Code Execution Vulnerability9.2 · Background exploitation
- CVE-2020-12271Sophos SFOS SQL Injection Vulnerability8.3 · Background exploitation