Vulnerability Monitor

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CVE-2025-49812

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.

Published

2025-07-10T17:15:48.193

Last Modified

2025-11-04T22:16:18.607

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.4 (HIGH)

Weaknesses

Type: Secondary
CWE-287

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	apache	http_server	< 2.4.64	Yes

References

https://httpd.apache.org/security/vulnerabilities_24.html Vendor Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2025/07/09/3 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2025/07/10/2 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2025/07/10/9 (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2025/08/msg00009.html (af854a3a-2127-422b-91ae-364da2661108)