CVE-2025-49812

HIGH EPSS 40.0%
Published Jul 10, 202511mo ago · Modified Jun 17, 20262w ago
7.4 CVSS 3.1
High
Find Similar
Published Jul 10, 2025 11mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.4
Exploitability
2.2
Impact
5.2
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
40.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-287 Improper Authentication Authentication

Affected Products 1

VendorProductVersionRange
apachehttp_server* <2.4.64

References 5

  • openwall.com http://www.openwall.com/lists/oss-security/2025/07/09/3
  • openwall.com http://www.openwall.com/lists/oss-security/2025/07/10/2
  • openwall.com http://www.openwall.com/lists/oss-security/2025/07/10/9
  • httpd.apache.org https://httpd.apache.org/security/vulnerabilities_24.html
    Vendor Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/08/msg00009.html

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.