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No exploitation reportedFix available

CVE-2025-6704

No exploitation reported by the sources we read.

  • Published2025-07-21
  • Fixed in21.0.2
  • WeaknessCWE-78

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2025-07-2114:15CVE publishedNVD

Versions per branch

NVD
Sophos firewall firmwareversion to verify
BranchAffectedFixed in
21.0< 21.0.221.0.2

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As Sophos, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Sophos Firewallother versions: not affected
    Affected
    • < 21.0 MR2 (21.0.2)fixed in 21.0 MR2 (21.0.2)semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2025-07-21

Fix

  1. Update Sophos firewall firmware to 21.0.2

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2025-07-21
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-5m7h-7mwc-924h

Frequently asked questions

What is CVE-2025-6704?

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.

Is CVE-2025-6704 actively exploited?

Active exploitation of CVE-2025-6704 has not been confirmed. Its EPSS score was 11.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-6704?

CVE-2025-6704 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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