{"schema_version":"1.9.0","id":"BIT-apache-2025-49812","published":"2025-07-16T07:56:35.377Z","modified":"2026-09-08T08:45:44.774340275Z","aliases":["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.","affected":[{"package":{"name":"apache","ecosystem":"Bitnami","purl":"pkg:bitnami/apache"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.4.64"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/apache/BIT-apache-2025-49812.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}],"references":[{"type":"ADVISORY","url":"https://httpd.apache.org/security/vulnerabilities_24.html"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-49812"},{"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"}],"database_specific":{"cpes":["cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*"],"severity":"High"}}