CVE-2021-33054: Debian Linux

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

SOGo 2.x before 2.4.1 and 3.x through 5.x before 5.1.1 does not validate the signatures of any SAML assertions it receives. Any actor with network access to the deployment could impersonate users when SAML is the authentication method. (Only versions after 2.0.5a are affected.)

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only; version 11.0 only
• Inverse Sogo: from 2.0.6, before 2.4.1 (fixed in 2.4.1); from 3.0.0, before 5.1.1 (fixed in 5.1.1)

Published 2021-06-04. Last modified 2026-06-17.