{"schema_version":"1.9.0","id":"CVE-2025-55753","published":"2025-12-05T10:12:22.041Z","modified":"2026-08-12T03:51:22.133073377Z","aliases":["BIT-apache-2025-55753"],"related":["ALSA-2025:23732","ALSA-2025:23738","ALSA-2025:23739","SUSE-SU-2025:4488-1","SUSE-SU-2025:4518-1","SUSE-SU-2026:0019-1","SUSE-SU-2026:0020-1","SUSE-SU-2026:20081-1","SUSE-SU-2026:21846-1","SUSE-SU-2026:2686-1","openSUSE-SU-2025:15808-1","openSUSE-SU-2026:20030-1","openSUSE-SU-2026:20810-1"],"summary":"Apache HTTP Server: mod_md (ACME), unintended retry intervals","details":"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.\n\nThis issue affects Apache HTTP Server: from 2.4.30 before 2.4.66.\n\n\nUsers are recommended to upgrade to version 2.4.66, which fixes the issue.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/httpd","events":[{"introduced":"3fe4a02b4936b73a10009ac8ea2c742730ccbe42"},{"fixed":"e4a77ef6051b3fe22eafacbcf54855b178a0bddd"}],"database_specific":{"cpe":"cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"2.4.30"},{"fixed":"2.4.66"}],"source":"CPE_RANGE"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-55753.json"}}],"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2025/12/04/4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55753.json"},{"type":"ADVISORY","url":"https://httpd.apache.org/security/vulnerabilities_24.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-55753"}],"database_specific":{"cna_assigner":"apache","cwe_ids":["CWE-190"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55753.json","unresolved_ranges":[{"extracted_events":[{"introduced":"2.4.30"},{"fixed":"2.4.66"}],"source":"AFFECTED_FIELD"},{"extracted_events":[{"introduced":"2.4.30"},{"fixed":"2.4.66"}],"source":"DESCRIPTION"}]},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}