{"id":"CVE-2025-49812","summary":"Apache HTTP Server: mod_ssl TLS upgrade attack","details":"In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade.\n\nOnly configurations using \"SSLEngine optional\" to enable TLS upgrades are affected. Users are recommended to upgrade to version 2.4.64, which removes support for TLS upgrade.","aliases":["BIT-apache-2025-49812"],"modified":"2026-05-18T05:59:33.453706708Z","published":"2025-07-10T16:58:23.943Z","related":["ALSA-2025:15023","ALSA-2025:15095","ALSA-2025:15123","SUSE-SU-2025:02565-1","SUSE-SU-2025:02682-1","SUSE-SU-2025:02683-1","SUSE-SU-2025:02684-1","SUSE-SU-2025:02685-1","openSUSE-SU-2025:15360-1","openSUSE-SU-2025:15369-1"],"database_specific":{"unresolved_ranges":[{"extracted_events":[{"last_affected":"2.4.63"}],"source":"AFFECTED_FIELD"}],"cwe_ids":["CWE-287"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/49xxx/CVE-2025-49812.json","cna_assigner":"apache"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2025/07/09/3"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2025/07/10/2"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2025/07/10/9"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/08/msg00009.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/49xxx/CVE-2025-49812.json"},{"type":"ADVISORY","url":"https://httpd.apache.org/security/vulnerabilities_24.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-49812"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/httpd","events":[{"introduced":"0"},{"fixed":"7e926454793abd7d71b6afc8bd1ec1648752c6ad"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.4.64"}],"source":"CPE_FIELD","cpe":"cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*"}}],"versions":["2.4.64-rc2-candidate"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-49812.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}