Enterprise Protection Backslash URL Rewrite Bypass, CVE-2025-0431
Advisory ID: PFPT-SA-2025-0001
An unauthenticated attacker could exploit a vulnerability in Enterprise Protection's URL rewriting to send an email that bypasses URL protections. This occurs due to improper filtering of backslashes within URLs.
Proofpoint On-Demand Customers
No action is required. Applicable fixes have already been deployed by Proofpoint.
Proofpoint On-Premises Customers
If you are running a supported version that is configured to deploy releases automatically, no action is required. Applicable fixes have been automatically deployed.
For on-premise environments that are configured to manually apply releases, install the applicable release as noted above.
If you are running an end of life release please upgrade to a supported release as soon as possible.
For any questions or concerns please contact Proofpoint Support.
Vulnerability Information
This vulnerability is identified by CVE-2025-0431. Proofpoint has released patches to address this issue.
This vulnerability has been assigned a CVSS score of 5.8 - MEDIUM:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:P/RL:U/RC:R
Fixed Software
Proofpoint has released fixed software versions:
8.18.6 patch 5113
8.20.6 patch 5114
8.21.0 patch 5115
All versions below the listed patch levels are vulnerable, including end-of-life software. The fixed software versions are now available through the customer support portal.
Acknowledgements
Thanks to Steve ZEITER DURAND from Rainbow Team LMFR who helped us identify this vulnerability.
URL
https://www.proofpoint.com/us/security/security-advisories/pfpt-sa-2025-0001
Revision History
| Version | Description | Section | Date |
|---|---|---|---|
| 1.0 | Initial Release | March 19, 2025 |
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