CVE-2025-49812

CWE-287 — Improper Authentication10 documents8 sources
Severity
7.4HIGH
EPSS
0.1%
top 67.25%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Apache Http ServerApache Software Foundation Apache Http Server
Timeline
PublishedJul 10
Latest updateAug 19

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 vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:NExploitability: 2.2 | Impact: 5.2

Affected Packages4 packages

▶NVDapache/http_server< 2.4.64
▶Alpineapache2< 2.4.64-r0+4
▶Debianapache2< 2.4.65-1~deb11u1+3

🔴Vulnerability Details

4
CVEList
Apache HTTP Server: mod_ssl TLS upgrade attack↗2025-07-10
▶
OSV
CVE-2025-49812: In some mod_ssl configurations on Apache HTTP Server versions through to 2↗2025-07-10
▶
OSV
CVE-2025-49812: In some mod_ssl configurations on Apache HTTP Server versions through to 2↗2025-07-10
▶
GHSA
GHSA-2mcx-3xj5-wg86: In some mod_ssl configurations on Apache HTTP Server versions through to 2↗2025-07-10
▶

📋Vendor Advisories

5
Ubuntu
Apache HTTP Server vulnerabilities↗2025-08-19
▶
Ubuntu
Apache HTTP Server vulnerabilities↗2025-07-16
▶
Red Hat
httpd: HTTP Session Hijack via a TLS upgrade↗2025-07-14
▶
Microsoft
Apache HTTP Server: mod_ssl TLS upgrade attack↗2025-07-08
▶
Debian
CVE-2025-49812: apache2 - In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63,...↗2025
▶