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.
References
| Link | Resource |
|---|---|
| https://httpd.apache.org/security/vulnerabilities_24.html | Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2025/12/04/4 | Issue Tracking Third Party Advisory |
Configurations
History
10 Dec 2025, 16:39
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://httpd.apache.org/security/vulnerabilities_24.html - Vendor Advisory | |
| References | () http://www.openwall.com/lists/oss-security/2025/12/04/4 - Issue Tracking, Third Party Advisory | |
| CPE | cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* | |
| First Time |
Apache http Server
Apache |
05 Dec 2025, 20:15
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
05 Dec 2025, 11:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-12-05 11:15
Updated : 2025-12-10 16:39
NVD link : CVE-2025-55753
Mitre link : CVE-2025-55753
CVE.ORG link : CVE-2025-55753
JSON object : View
Products Affected
apache
- http_server
CWE
CWE-190
Integer Overflow or Wraparound