CVE-2025-55753

Apache HTTP Server: mod_md (ACME), unintended retry intervals

CVSS 7.5 HIGHEPSS 0.4%CWE-190

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Produtos afetados

Apache Software Foundation · Apache HTTP Server

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Referências

https://httpd.apache.org/security/vulnerabilities_24.html http://www.openwall.com/lists/oss-security/2025/12/04/4