Vulnerability Monitor

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CVE-2025-55753

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.

Published

2025-12-05T11:15:51.890

Last Modified

2025-12-10T16:39:14.227

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

Weaknesses

Type: Secondary
CWE-190

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	apache	http_server	< 2.4.66	Yes

References

https://httpd.apache.org/security/vulnerabilities_24.html Vendor Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2025/12/04/4 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)