{"id":"CVE-2025-3891","title":"A flaw was found in the mod_auth_openidc module for Apache httpd","summary":"A flaw was found in the mod_auth_openidc module for Apache httpd. This flaw allows a remote, unauthenticated attacker to trigger a denial of service by sending an empty POST request when the OIDCPreservePost directive is enabled. The ser…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-248"],"vendor":"apache","product":"http_server","affected":["http_server","enterprise_linux = 7.0","enterprise_linux = 8.0","enterprise_linux = 9.0","debian_linux = 11.0"],"published":"2025-04-29","updated":"2026-06-25","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-3891","references":[{"url":"https://access.redhat.com/errata/RHSA-2025:10002","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:10003","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:10004","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:10006","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:10007","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:10008","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:10010","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:4597","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:9396","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2025-3891","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2361633","label":"secalert@redhat.com"},{"url":"https://github.com/OpenIDC/mod_auth_openidc/commit/6a0b5f66c87184dfe0e4400f6bdd46a82dc0ec2b","label":"secalert@redhat.com"},{"url":"https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-x7cf-8wgv-5j86","label":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00007.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.01424,"epssPercentile":0.7173,"ingestedAt":"2026-06-29T13:24:34.201Z","slug":"CVE-2025-3891","body":"## Overview\n\nA flaw was found in the mod_auth_openidc module for Apache httpd. This flaw allows a remote, unauthenticated attacker to trigger a denial of service by sending an empty POST request when the OIDCPreservePost directive is enabled. The server crashes consistently, affecting availability.\n\n## Affected\n\n- `http_server`\n- `enterprise_linux = 7.0`\n- `enterprise_linux = 8.0`\n- `enterprise_linux = 9.0`\n- `debian_linux = 11.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}