CVE-2025-49812

Apache HTTP Server: mod_ssl TLS upgrade attack

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.

Category

N/A
CVSS
Severity:
EPSS 0.02%
Vendor Advisory apache.org
Affected: Apache Software Foundation Apache HTTP Server
Published at:
Updated at:

References

Link Tags
https://httpd.apache.org/security/vulnerabilities_24.html vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-49812?
CVE-2025-49812 has not yet been assigned a CVSS score.
How to fix CVE-2025-49812?
To fix CVE-2025-49812, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-49812 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-49812 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-49812?
CVE-2025-49812 affects Apache Software Foundation Apache HTTP Server.
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