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

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 10 Dec 2025 16:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*

Tue, 09 Dec 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Fri, 05 Dec 2025 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache http Server
Vendors & Products Apache
Apache http Server

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 : Analyzed

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

Modified: 2025-12-10T16:39:14.227

Link: CVE-2025-55753

cve-icon Redhat

Severity : Important

Publid Date: 2025-12-05T10:12:22Z

Links: CVE-2025-55753 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-12-05T20:56:21Z

Weaknesses