{"id":"UBUNTU-CVE-2025-55753","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. 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.","modified":"2026-05-29T10:59:08.519937569Z","published":"2025-12-05T11:15:00Z","related":["USN-7968-1","USN-8338-1"],"upstream":["CVE-2025-55753"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-55753"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-55753"},{"type":"REPORT","url":"https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2025-55753"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7968-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8338-1"}],"affected":[{"package":{"name":"apache2","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/apache2?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.41-4ubuntu3.23+esm3"}]}],"versions":["2.4.41-1ubuntu1","2.4.41-4ubuntu1","2.4.41-4ubuntu2","2.4.41-4ubuntu3","2.4.41-4ubuntu3.1","2.4.41-4ubuntu3.3","2.4.41-4ubuntu3.4","2.4.41-4ubuntu3.5","2.4.41-4ubuntu3.6","2.4.41-4ubuntu3.7","2.4.41-4ubuntu3.8","2.4.41-4ubuntu3.9","2.4.41-4ubuntu3.10","2.4.41-4ubuntu3.11","2.4.41-4ubuntu3.12","2.4.41-4ubuntu3.13","2.4.41-4ubuntu3.14","2.4.41-4ubuntu3.15","2.4.41-4ubuntu3.16","2.4.41-4ubuntu3.17","2.4.41-4ubuntu3.19","2.4.41-4ubuntu3.20","2.4.41-4ubuntu3.21","2.4.41-4ubuntu3.23","2.4.41-4ubuntu3.23+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.4.41-4ubuntu3.23+esm3","binary_name":"apache2"},{"binary_version":"2.4.41-4ubuntu3.23+esm3","binary_name":"apache2-bin"},{"binary_name":"apache2-data","binary_version":"2.4.41-4ubuntu3.23+esm3"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.41-4ubuntu3.23+esm3"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.41-4ubuntu3.23+esm3"},{"binary_version":"2.4.41-4ubuntu3.23+esm3","binary_name":"apache2-utils"},{"binary_version":"2.4.41-4ubuntu3.23+esm3","binary_name":"libapache2-mod-md"},{"binary_version":"2.4.41-4ubuntu3.23+esm3","binary_name":"libapache2-mod-proxy-uwsgi"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","priority_reason":"Apache developers have rated this as being low severity"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-55753.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/apache2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.52-1ubuntu4.18"}]}],"versions":["2.4.48-3.1ubuntu3","2.4.48-3.1ubuntu4","2.4.51-2ubuntu1","2.4.52-1ubuntu1","2.4.52-1ubuntu2","2.4.52-1ubuntu4","2.4.52-1ubuntu4.1","2.4.52-1ubuntu4.2","2.4.52-1ubuntu4.3","2.4.52-1ubuntu4.4","2.4.52-1ubuntu4.5","2.4.52-1ubuntu4.6","2.4.52-1ubuntu4.7","2.4.52-1ubuntu4.8","2.4.52-1ubuntu4.9","2.4.52-1ubuntu4.10","2.4.52-1ubuntu4.11","2.4.52-1ubuntu4.12","2.4.52-1ubuntu4.13","2.4.52-1ubuntu4.14","2.4.52-1ubuntu4.15","2.4.52-1ubuntu4.16"],"ecosystem_specific":{"binaries":[{"binary_name":"apache2","binary_version":"2.4.52-1ubuntu4.18"},{"binary_name":"apache2-bin","binary_version":"2.4.52-1ubuntu4.18"},{"binary_version":"2.4.52-1ubuntu4.18","binary_name":"apache2-data"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.52-1ubuntu4.18"},{"binary_version":"2.4.52-1ubuntu4.18","binary_name":"apache2-suexec-pristine"},{"binary_name":"apache2-utils","binary_version":"2.4.52-1ubuntu4.18"},{"binary_name":"libapache2-mod-md","binary_version":"2.4.52-1ubuntu4.18"},{"binary_name":"libapache2-mod-proxy-uwsgi","binary_version":"2.4.52-1ubuntu4.18"}],"availability":"No subscription required","priority_reason":"Apache developers have rated this as being low severity"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-55753.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/apache2?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.58-1ubuntu8.10"}]}],"versions":["2.4.57-2ubuntu2","2.4.57-2ubuntu3","2.4.58-1ubuntu1","2.4.58-1ubuntu2","2.4.58-1ubuntu6","2.4.58-1ubuntu7","2.4.58-1ubuntu8","2.4.58-1ubuntu8.1","2.4.58-1ubuntu8.2","2.4.58-1ubuntu8.3","2.4.58-1ubuntu8.4","2.4.58-1ubuntu8.5","2.4.58-1ubuntu8.6","2.4.58-1ubuntu8.7","2.4.58-1ubuntu8.8"],"ecosystem_specific":{"binaries":[{"binary_name":"apache2","binary_version":"2.4.58-1ubuntu8.10"},{"binary_version":"2.4.58-1ubuntu8.10","binary_name":"apache2-bin"},{"binary_name":"apache2-data","binary_version":"2.4.58-1ubuntu8.10"},{"binary_version":"2.4.58-1ubuntu8.10","binary_name":"apache2-suexec-custom"},{"binary_version":"2.4.58-1ubuntu8.10","binary_name":"apache2-suexec-pristine"},{"binary_name":"apache2-utils","binary_version":"2.4.58-1ubuntu8.10"},{"binary_name":"libapache2-mod-md","binary_version":"2.4.58-1ubuntu8.10"},{"binary_version":"2.4.58-1ubuntu8.10","binary_name":"libapache2-mod-proxy-uwsgi"}],"availability":"No subscription required","priority_reason":"Apache developers have rated this as being low severity"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-55753.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/apache2?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.64-1ubuntu3.2"}]}],"versions":["2.4.63-1ubuntu1","2.4.63-1ubuntu3","2.4.64-1ubuntu2","2.4.64-1ubuntu3"],"ecosystem_specific":{"availability":"No subscription required","priority_reason":"Apache developers have rated this as being low severity","binaries":[{"binary_version":"2.4.64-1ubuntu3.2","binary_name":"apache2"},{"binary_name":"apache2-bin","binary_version":"2.4.64-1ubuntu3.2"},{"binary_version":"2.4.64-1ubuntu3.2","binary_name":"apache2-data"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.64-1ubuntu3.2"},{"binary_version":"2.4.64-1ubuntu3.2","binary_name":"apache2-suexec-pristine"},{"binary_version":"2.4.64-1ubuntu3.2","binary_name":"apache2-utils"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-55753.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/apache2?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.66-2ubuntu1"}]}],"versions":["2.4.64-1ubuntu3","2.4.65-3ubuntu1"],"ecosystem_specific":{"priority_reason":"Apache developers have rated this as being low 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