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CVE-2025-49812
Published: Jul 10, 2025
Modified: Nov 4, 2025
PUBLISHED
Description
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.
| Vendor | Product | Versions |
|---|---|---|
Apache Software Foundation | Apache HTTP Server | affected 0 - <= 2.4.63 |
Weaknesses (CWE)
References
https://httpd.apache.org/security/vulnerabilities_24.html
vendor-advisory
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