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CVE-2025-49812

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Date: July 10, 2025

In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. Only configurations using "SSLEngine optional" to enable TLS upgrades are affected. Users are recommended to upgrade to version 2.4.64, which removes support for TLS upgrade.

Severity Score

Related Resources (5)

https://security.alpinelinux.org/vuln/CVE-2025-49812
https://security-tracker.debian.org/tracker/CVE-2025-49812
https://nvd.nist.gov/vuln/detail/CVE-2025-49812
https://httpd.apache.org/security/vulnerabilities_24.html
https://www.mend.io/vulnerability-database/CVE-2025-49812

Severity Score

Weakness Type (CWE)

Improper Authentication

CWE-287

Top Fix

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Upgrade Version

Upgrade to version https://github.com/apache/httpd.git - 2.4.64

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): NONE

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