Sophos Firewall and UTM
CVE-2025-6704: Arbitrary file writing in Sophos Firewall
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.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Sophos Firewall 0 | 21.0 MR2 (21.0.2) or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it 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.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.