CVE-2025-55753
published 2025-12-05CVE-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…
high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apache | http_server | >= 2.4.30 < 2.4.66 | 2.4.66 |
| apache_software_foundation | apache_http_server | >= 2.4.30 < 2.4.66 | 2.4.66 |
| debian | apache2 | < apache2 2.4.66-1~deb12u1 (bookworm) | apache2 2.4.66-1~deb12u1 (bookworm) |
| msrc | azl3_httpd_2.4.65-1_on_azure_linux_3.0 | — | — |
| msrc | cbl2_httpd_2.4.65-1_on_cbl_mariner_2.0 | — | — |
| ubuntu | apache2 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
osv7.5HIGH