CVE-2023-5552: Sophos Firewall

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

A password disclosure vulnerability in the Secure PDF eXchange (SPX) feature allows attackers with full email access to decrypt PDFs in Sophos Firewall version 19.5 MR3 (19.5.3) and older, if the password type is set to “Specified by sender”.

Affected products

• Sophos Firewall: up to and including 19.5.3

Published 2023-10-18. Last modified 2026-06-17.