Severity: low Affected versions:
- Apache HTTP Server 2.4.30 before 2.4.66 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. Credit: Aisle Research (finder) References: https://httpd.apache.org/security/vulnerabilities_24.html https://httpd.apache.org/ https://www.cve.org/CVERecord?id=CVE-2025-55753 Timeline: 2025-08-15: reported 2025-11-20: fixed by r1929884 in 2.4.x
