#VU105927 Input validation error in Proofpoint Enterprise Protection - CVE-2025-0431

Vulnerability identifier: #VU105927

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-0431

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Proofpoint Enterprise Protection
Server applications / DLP, anti-spam, sniffers

Vendor: Proofpoint

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to an error when handling backslah URLs in the rewriting mechanism. A remote attacker can send an email that bypasses implemented URL protections.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Proofpoint Enterprise Protection: before 8.18.6

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External links
https://www.proofpoint.com/us/security/security-advisories/pfpt-sa-2025-0001

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.