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.
| Software | From | Fixed in |
|---|---|---|
| proofpoint / enterprise_protection | 8.18.6 | 8.18.6.x |
| proofpoint / enterprise_protection | 8.20.6 | 8.20.6.x |
| proofpoint / enterprise_protection | 8.21.0 | 8.21.0.x |