Email Protection
CVE-2025-0431: Enterprise Protection Backslash URL Rewrite Bypass
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.
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 5113 or later |
| Enterprise Protection 8.20 | patch 5114 or later |
| Enterprise Protection 8.21 | patch 5115 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.