CVE-2025-6704

Name: CVE-2025-6704
Creator: NVD / NIST
Published: 2025-07-21T14:15:30.133+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 8.19%

Last modified Jun 17, 2026

CVE-2025-6704 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 8.19% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

8.19%

94.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Sophos	Firewall Firmware	< 21.0.2

References

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

Timeline

Published: Jul 21, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-6704?

How severe is CVE-2025-6704?

CVE-2025-6704 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 8.19% probability of exploitation in the next 30 days.

How do I fix CVE-2025-6704?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-6704?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST