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CVE-2025-49812

7.4 · HIGH

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.

Published Jul 10, 2025CWE-287EPSS 0.61%

Overview

CVE-2025-49812 is a high-severity vulnerability. It was published on July 10, 2025 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refhttpd.apache.org/security/vulnerabilities_24.htmlRefwww.openwall.com/lists/oss-security/2025/07/09/3Refwww.openwall.com/lists/oss-security/2025/07/10/2Refwww.openwall.com/lists/oss-security/2025/07/10/9Reflists.debian.org/debian-lts-announce/2025/08/msg00009.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-49812?

CVE-2025-49812 is a high-severity vulnerability. It was published on July 10, 2025 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2025-49812?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-49812?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-49812?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-49812 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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