Integer Overflow or Wraparound Affecting apache2 package, versions <2.4.41-4ubuntu3.23+esm3


Severity

Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.44% (37th percentile)

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  • Snyk IDSNYK-UBUNTU2004-APACHE2-14193243
  • published29 May 2026
  • disclosed5 Dec 2025

Introduced: 5 Dec 2025

CVE-2025-55753  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade Ubuntu:20.04 apache2 to version 2.4.41-4ubuntu3.23+esm3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream apache2 package and not the apache2 package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

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 Base Scores

version 3.1