{"id":"CVE-2025-3891","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-3891","generatedAt":"2026-10-28T01:48:08.641Z","title":"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.","description":"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 server crashes consistently, affecting availability.","published":"2025-04-29T12:15:32.000Z","lastModified":"2026-06-29T21:16:36.000Z","status":"Modified","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-248"],"affected":["apache/http server","redhat/enterprise linux","debian/debian linux"],"epss":{"score":0.01576,"percentile":0.75292,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.58%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2025:10002","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:10003","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:10004","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:10006","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:10007","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:10008","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:10010","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:4597","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:9396","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2025-3891","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2361633","tags":["Issue Tracking"],"source":"secalert@redhat.com"},{"url":"https://github.com/OpenIDC/mod_auth_openidc/commit/6a0b5f66c87184dfe0e4400f6bdd46a82dc0ec2b","source":"secalert@redhat.com"},{"url":"https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-x7cf-8wgv-5j86","source":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00007.html","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-3891","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}