7.5

CVE-2025-55753: apache software foundation apache http server Integer Overflow or Wraparound

CVSS: 7.5v3.1HighAnalyzed
AliasesALPINE-CVE-2025-55753RHSA-2025:23738RHSA-2025:23739
Published 05-12-2025Last modified 05-12-2025
Open JSON

Vulnerability summary

CVE-2025-55753 is a high (CVSS 7.5) Integer Overflow or Wraparound vulnerability in apache software foundation apache http server. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 37.6% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.45%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 18 · Related 10
DLA-4452-1MGASA-2025-0322OPENSUSE-SU-2025:15808-1OPENSUSE-SU-2026:20030-1RHSA-2025:23732RHSA-2026:0009

Timeline

  1. 05-12-2025
    PublishedVulnerability first disclosed.
  2. 05-12-2025
    Last modifiedVulnerability information updated.

Description

An integer overflow in the case of failed ACME certificate renewal leads, after a number of failures (~30 days in default configurations), to the backoff timer becoming 0. Attempts to renew the certificate then are repeated without delays until it succeeds. This issue affects Apache HTTP Server: from 2.4.30 before 2.4.66. Users are recommended to upgrade to version 2.4.66, which fixes the issue.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

0.00 pp

From 0.45% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.45%

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

Redhat3 products
  • mod_md< 1:2.4.19-1.el9_4.1 | < 1:2.4.19-1.el9_2.1 | < 1:2.4.0-3.el9_0.1 | < 1:2.4.26-3.el10_0.1 | < 1:2.4.26-1.el9_6.1 | < 1:2.4.26-4.el10_1 | < 1:2.4.26-1.el9_7.1
  • mod_md-debuginfo< 1:2.4.19-1.el9_4.1 | < 1:2.4.19-1.el9_2.1 | < 1:2.4.0-3.el9_0.1 | < 1:2.4.26-3.el10_0.1 | < 1:2.4.26-1.el9_6.1 | < 1:2.4.26-4.el10_1 | < 1:2.4.26-1.el9_7.1
  • mod_md-debugsource< 1:2.4.19-1.el9_4.1 | < 1:2.4.19-1.el9_2.1 | < 1:2.4.0-3.el9_0.1 | < 1:2.4.26-3.el10_0.1 | < 1:2.4.26-1.el9_6.1 | < 1:2.4.26-4.el10_1 | < 1:2.4.26-1.el9_7.1
Alpine1 product
  • apache2< 2.4.66-r0
Apache1 product
Apache software foundation1 product
Debian1 product
  • apache2< 2.4.66-1~deb12u1 | < 2.4.66-1~deb13u1 | < 2.4.66-1
Ubuntu1 product
  • apache2< 2.4.41-4ubuntu3.23+esm3 | < 2.4.52-1ubuntu4.18 | < 2.4.58-1ubuntu8.10 | < 2.4.64-1ubuntu3.2 | < 2.4.66-2ubuntu1

6 vendors · 8 products

References

27 links
Show all 27 references