CVE-2025-49812 - CVE House
Back to Database
Status published Unknown CVE-2025-49812

Apache HTTP Server: mod_ssl TLS upgrade attack

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2025-49812

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Robert Merget (Technology Innovation Institute)
  • Nurullah Erinola (Ruhr University Bochum)
  • Marcel Maehren (Ruhr University Bochum)
  • Lukas Knittel (Ruhr University Bochum)
  • Sven Hebrok (Paderborn University)
  • Marcus Brinkmann (Ruhr University Bochum)
  • Juraj Somorovsky (Paderborn University)
  • Jörg Schwenk (Ruhr University Bochum)

References

More from Apache Software Foundation

View All →
CVE-2025-69233
Apache CloudStack: Domain/account resources limits not honored
Medium 6.5
CVE-2025-69219
Apache Airflow Providers Http: Unsafe Pickle Deserialization in apache-airflow-providers-http leading to RCE via HttpOperator
Unknown 0
CVE-2025-68675
Apache Airflow: proxy credentials for various providers might leak in task logs
Unknown 0
CVE-2025-68637
Apache Uniffle: Insecure SSL Configuration in Uniffle HTTP Client
Unknown 0
CVE-2025-68493
Apache Struts, Apache Struts: XXE vulnerability in outdated XWork component
Unknown 0

Affected Vendor

Apache Software Foundation

View all reports →

Affected Software

Apache HTTP Server
Vulnerable Versions:
0

Timeline

Official Publish: July 10th, 2025
Last Modified: November 4th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

No vector data available

Weaknesses (CWE)

CWE-287

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1078 Valid Accounts
Persistence
T1556 Modify Authentication Process
Credential Access