CVE-2025-55753 — Apache HTTP Server: mod_md (ACME), unintended retry intervals

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Apache Software Foundation / Apache HTTP Server	affected 2.4.30 before 2.4.66

CWE

CWE-190

References

https://httpd.apache.org/security/vulnerabilities_24.html

ADP enrichment

CVE

No English description supplied.

http://www.openwall.com/lists/oss-security/2025/12/04/4

CISA-ADP

No English description supplied.

No references supplied.