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Message-ID: <2d695126-80fb-9e45-4555-bf91c2fb9ffe@apache.org>
Date: Thu, 04 Dec 2025 14:40:39 +0000
From: Eric Covener <covener@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2025-55753: Apache HTTP Server: mod_md (ACME), unintended
retry intervals
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
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