CVE-2024-10635: Proofpoint Enterprise Protection

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Enterprise Protection contains an improper input validation vulnerability in attachment defense that allows an unauthenticated remote attacker to bypass attachment scanning security policy by sending a malicious S/MIME attachment with an opaque signature. When opened by a recipient in a downstream email client, the malicious attachment could cause partial loss of integrity and confidentiality to their system.

Affected products

• Proofpoint Enterprise Protection: version 8.18.6 only; version 8.20.6 only; version 8.21.0 only

Published 2025-04-28. Last modified 2026-06-17.