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Vulnerability record · CVE-2025-6704 · published 21 July 2025

CVE-2025-6704: Sophos firewall firmware os command injection vulnerability

Sophos · Firewall Firmware

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.

9.8 CVSS 3.1 Critical EPSS 9.5% · top 4.7% CWE-78 · OS command injection
9.8CVSS 3.1 base score
9.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.sophos.com/en-us/security-advisories/sophos-sa-20250721-sfos-rce Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-7624Sophos firewall firmware sql injection vulnerabilityAn SQL injection vulnerability in the legacy (transparent) SMTP proxy of Sophos Firewall versions older than 21.0 MR2 (21.0.2) can lead to remote cod…EPSS 8.5%9.8CVE-2024-12727Sophos firewall firmware sql injection vulnerabilityA pre-auth SQL injection vulnerability in the email protection feature of Sophos Firewall versions older than 21.0 MR1 (21.0.1) allows access to the …EPSS 1.4%9.8CVE-2024-12728Sophos firewall firmware vulnerabilityA weak credentials vulnerability potentially allows privileged system access via SSH to Sophos Firewall older than version 20.0 MR3 (20.0.3).EPSS 0.94%8.8CVE-2025-7382Sophos firewall firmware os command injection vulnerabilityA command injection vulnerability in WebAdmin of Sophos Firewall versions older than 21.0 MR2 (21.0.2) can lead to adjacent attackers achieving pre-a…EPSS 4.8%8.8CVE-2024-12729Sophos firewall firmware code injection vulnerabilityA post-auth code injection vulnerability in the User Portal allows authenticated users to execute code remotely in Sophos Firewall older than version…EPSS 1.3%8.4CVE-2021-25267Sophos firewall firmware cross-site scripting vulnerabilityMultiple XSS vulnerabilities in Webadmin allow for privilege escalation from admin to super-admin in Sophos Firewall older than version 19.0 GA.EPSS 1.1%8.4CVE-2021-25268Sophos firewall firmware cross-site scripting vulnerabilityMultiple XSS vulnerabilities in Webadmin allow for privilege escalation from MySophos admin to SFOS admin in Sophos Firewall older than version 19.0 …EPSS 0.91%8.1CVE-2024-13974Sophos firewall firmware vulnerabilityA business logic vulnerability in the Up2Date component of Sophos Firewall older than version 21.0 MR1 (20.0.1) can lead to attackers controlling the…EPSS 7.4%

Source: NIST National Vulnerability Database (record CVE-2025-6704), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.