Sophos Firewall up to 21.0 MR1 Secure PDF eXchange os command injection

Summaryinfo

A vulnerability identified as critical has been detected in Sophos Firewall up to 21.0 MR1. Affected by this issue is some unknown functionality of the component Secure PDF eXchange. Performing a manipulation results in os command injection. This vulnerability is cataloged as CVE-2025-6704. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Sophos Firewall up to 21.0 MR1. This affects some unknown functionality of the component Secure PDF eXchange. The manipulation with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

An arbitrary file writing vulnerability in the Secure PDF eXchange (SPX) feature of Sophos Firewall versions older than 21.0 MR2 (21.0.2) can lead to pre-auth remote code execution, if a specific configuration of SPX is enabled in combination with the firewall running in High Availability (HA) mode.

The advisory is shared at sophos.com. This vulnerability is uniquely identified as CVE-2025-6704 since 06/26/2025. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1202 for this issue.

Upgrading to version 21.0 MR2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-22086). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Firewall Software

Vendor

• Sophos

Name

• Firewall

Version

• 21.0 MR1

License

• commercial

Website

• Vendor: https://www.sophos.com/

CPE 2.3info

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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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