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CVE-2025-0431— Enterprise Protection Backslash URL Rewrite Bypass

Quick assessment

Affected
Proofpoint Enterprise Protection
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Proofpoint Enterprise Protection是美国Proofpoint公司的一个应用程序。提供了保护电子邮件的功能。 Proofpoint Enterprise Protection 8.21.0 patch 5115之前版本、8.20.6 patch 5114之前版本和8.18.6 patch 5113之前版本存在安全漏洞，该漏洞源于URL重写中对反斜杠的过滤不当，可能导致未经验证的远程攻击者发送绕过URL保护的电子邮件，影响接收者邮件的完整性。

CVSS 5.8 · Medium EPSS 0.41% · P33
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I. Basic Information for CVE-2025-0431

Vulnerability Information
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Vulnerability Title
Enterprise Protection Backslash URL Rewrite Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Enterprise Protection contains a vulnerability in URL rewriting that allows an unauthenticated remote attacker to send an email which bypasses URL protections impacting the integrity of recipient's email. This occurs due to improper filtering of backslashes within URLs and affects all versions of 8.21, 8.20 and 8.18 prior to 8.21.0 patch 5115, 8.20.6 patch 5114 and 8.18.6 patch 5113 respectively.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特殊元素过滤不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Proofpoint Enterprise Protection 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Proofpoint Enterprise Protection是美国Proofpoint公司的一个应用程序。提供了保护电子邮件的功能。 Proofpoint Enterprise Protection 8.21.0 patch 5115之前版本、8.20.6 patch 5114之前版本和8.18.6 patch 5113之前版本存在安全漏洞，该漏洞源于URL重写中对反斜杠的过滤不当，可能导致未经验证的远程攻击者发送绕过URL保护的电子邮件，影响接收者邮件的完整性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Proofpoint Enterprise Protection 8.18.6 ~ patch 5113 -

II. Public POCs for CVE-2025-0431

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III. Intelligence Information for CVE-2025-0431

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Other References for CVE-2025-0431 (1)

IV. Related Vulnerabilities

Same product: Enterprise Protection
Same vendor: Proofpoint
Same weakness: CWE-790

V. Comments for CVE-2025-0431

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