Unauthenticated RCE via DNS-controlled update retrieval
Published Jul 21, 2025 · Updated Jul 21, 2025
Business logic flaw in Sophos Firewall 21.0 GA and earlier allows remote attackers to execute code by controlling its DNS environment. The Up2Date component relies on attacker-controlled DNS results during update retrieval; Sophos has not disclosed the precise validation failure. Exploitation requires control of the firewall's DNS environment and can compromise confidentiality, integrity, and availability without credentials or user interaction.
Summary
What happened
Business logic flaw in Sophos Firewall 21.0 GA and earlier allows remote attackers to execute code by controlling its DNS environment. The Up2Date component relies on attacker-controlled DNS results during update retrieval; Sophos has not disclosed the precise validation failure. Exploitation requires control of the firewall's DNS environment and can compromise confidentiality, integrity, and availability without credentials or user interaction.
The record
- CVE
- CVE-2024-13974
- Published
- Jul 21, 2025
- Updated
- Jul 21, 2025
- Vendor
- Sophos
- Product
- Sophos Firewall
- Classifications
- CWE-807, CAPEC-598
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 21, 2025CVE publishedPublication date reported by the CVE source.
- Jul 21, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <21.0 MR1 (21.0.1)
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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