VULNERABILITY INTELLIGENCE

CVE-2025-55753

CVSS score7.5 HIGH
EPSS probability0.45%
CISA KEVNot currently listed
Published2025-12-05
Last modified2026-10-18
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Weakness classification

  • security@apache.org: CWE-190

Primary references