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CVE-2025-55753

Good to know:

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Date: December 5, 2025

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.

Severity Score

Related Resources (4)

http://www.openwall.com/lists/oss-security/2025/12/04/4
https://httpd.apache.org/security/vulnerabilities_24.html
https://nvd.nist.gov/vuln/detail/CVE-2025-55753
https://www.mend.io/vulnerability-database/CVE-2025-55753

Severity Score

Weakness Type (CWE)

Integer Overflow or Wraparound

CWE-190

Top Fix

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Upgrade Version

Upgrade to version https://github.com/apache/httpd.git - 2.4.66

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

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