7.4

CVE-2025-49812: apache software foundation apache http server Improper Authentication

CVSS: 7.4v3.1HighModified
AliasesALPINE-CVE-2025-49812RHSA-2025:14998RHSA-2025:15036
Published 10-07-2025Last modified 04-11-2025
Open JSON

Vulnerability summary

CVE-2025-49812 is a high (CVSS 7.4) Improper Authentication vulnerability in apache software foundation apache http server. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 48.3% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.61%
0%100%
Low · +0.06 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 25 · Related 11
DLA-4270-1MGASA-2025-0301OPENSUSE-SU-2025:15360-1OPENSUSE-SU-2026:20962-1RHSA-2025:13680RHSA-2025:14901

Timeline

  1. 10-07-2025
    PublishedVulnerability first disclosed.
  2. 04-11-2025
    Last modifiedVulnerability information updated.

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 metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.61%

Chance of exploitation in the next 30 days

Percentile

48%

Versus all other CVEs

30-day change

+0.06 pp

From 0.56% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.61%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat9 products
  • httpd< 0:2.4.6-90.el7_7.6 | < 0:2.2.15-71.el6_10.1
  • httpd-debuginfo< 0:2.4.6-90.el7_7.6 | < 0:2.2.15-71.el6_10.1
  • httpd-devel< 0:2.4.6-90.el7_7.6 | < 0:2.2.15-71.el6_10.1
  • httpd-manual< 0:2.4.6-90.el7_7.6 | < 0:2.2.15-71.el6_10.1
  • httpd-tools< 0:2.4.6-90.el7_7.6 | < 0:2.2.15-71.el6_10.1
Alpine1 product
  • apache2< 2.4.64-r0
Apache1 product
Apache software foundation1 product
Debian1 product
  • apache2< 2.4.65-1~deb12u1 | < 2.4.64-1
Opensuse1 product
  • cyrus-imapd&distro=openSUSE Tumbleweed< 3.8.6-1.1
Ubuntu1 product
  • apache2< 2.4.7-1ubuntu4.22+esm12 | < 2.4.18-2ubuntu3.17+esm16 | < 2.4.29-1ubuntu4.27+esm6 | < 2.4.41-4ubuntu3.23+esm2 | < 2.4.52-1ubuntu4.15 | < 2.4.58-1ubuntu8.7

7 vendors · 15 products

References

22 links
Show all 22 references