UpHeron
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Servers and applications

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.

Severity
High 7.5
Published
5 Dec 2025
Last changed
18 Oct 2026
Added to UpHeron
17 Oct 2026
Fixed in
2.4.66
Sources
NVD

Affected software

SoftwareAffected versions
Apache HTTP ServerServers and applications · cpe:a:apache:http_server
  • From 2.4.30 before 2.4.66

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-55753
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-55753