CVE-2025-55753

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.

PUBLISHED Reserved 2025-08-15 | Published 2025-12-05 | Updated 2025-12-05 | Assigner apache

Problem types

CWE-190 Integer Overflow or Wraparound

Product status

Timeline

Credits

Aisle Research finder

References

www.openwall.com/lists/oss-security/2025/12/04/4

httpd.apache.org/security/vulnerabilities_24.html vendor-advisory

cve.org (CVE-2025-55753)

nvd.nist.gov (CVE-2025-55753)