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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

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

Configuration 1 (hide)

cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*

History

18 Oct 2026, 15:10

Type	Values Removed	Values Added
Summary		(es) Un desbordamiento de entero en el caso de una renovación de certificado ACME fallida produce, tras una serie de fallos (~30?días en configuraciones predeterminadas), que el temporizador de retroceso pase a 0. Los intentos de renovar el certificado entonces se repiten sin demoras hasta que tengan éxito. Este problema afecta al Servidor HTTP Apache: desde la versión?2.4.30 hasta antes de la?2.4.66. Se recomienda a los usuarios que actualicen a la versión?2.4.66, que corrige el problema.

Information

Published : 2025-12-05 11:15

Updated : 2026-10-18 15:10

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

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