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.
Advisories

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Fri, 05 Dec 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 05 Dec 2025 11:30:00 +0000

Type Values Removed Values Added
References

Fri, 05 Dec 2025 10:30:00 +0000

Type Values Removed Values Added
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.
Title Apache HTTP Server: mod_md (ACME), unintended retry intervals
Weaknesses CWE-190
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2025-12-05T19:27:31.842Z

Reserved: 2025-08-15T08:38:37.265Z

Link: CVE-2025-55753

cve-icon Vulnrichment

Updated: 2025-12-05T11:05:52.628Z

cve-icon NVD

Status : Received

Published: 2025-12-05T11:15:51.890

Modified: 2025-12-05T20:15:56.450

Link: CVE-2025-55753

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses