What is CVE-2025-49812?

CVE-2025-49812 is a high-severity vulnerability in Apache Http_server, classified under Improper Authentication. CVSS score: 7.4/10. Published 2025-07-10.

How severe is CVE-2025-49812?

High severity. CVSS v3 base score is 7.4 out of 10.

Is CVE-2025-49812 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Apache Http_server

CVE-2025-49812

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 option…

Vulnerability class: Broken Authentication

EPSS: 0.005 (40.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Apache Http_server
Apache Software Foundation Http Server — versions 0

Weakness classification (CWE)

CWE-287 — Improper Authentication

Public proof-of-concept exploits

References

security@apache.org (vendor-advisory, Vendor Advisory)
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af854a3a-2127-422b-91ae-364da2661108
af854a3a-2127-422b-91ae-364da2661108
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2025-49812?: CVE-2025-49812 is a high-severity vulnerability in Apache Http_server, classified under Improper Authentication. CVSS score: 7.4/10. Published 2025-07-10.
How severe is CVE-2025-49812?: High severity. CVSS v3 base score is 7.4 out of 10.
Is CVE-2025-49812 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.