Email Protection
CVE-2024-10635: Enterprise Protection S/MIME Opaque Signature Attachment Scanning Bypass
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.
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 |
|---|---|
| Enterprise Protection 8.18 | patch 4868 or later |
| Enterprise Protection 8.20 | patch 4871 or later |
| Enterprise Protection 8.21 | patch 4872 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.