{"id":"CVE-2023-40547","summary":"Shim: rce in http boot support may lead to secure boot bypass","details":"A remote code execution vulnerability was found in Shim. The Shim boot support trusts attacker-controlled values when parsing an HTTP response. This flaw allows an attacker to craft a specific malicious HTTP request, leading to a completely controlled out-of-bounds write primitive and complete system compromise. This flaw is only exploitable during the early boot phase, an attacker needs to perform a Man-in-the-Middle or compromise the boot server to be able to exploit this vulnerability successfully.","modified":"2026-08-12T03:51:25.361430257Z","published":"2024-01-25T15:54:23.102Z","related":["ALSA-2024:1902","ALSA-2024:1903","SUSE-SU-2024:1368-1","SUSE-SU-2024:1461-1","SUSE-SU-2024:1462-1","SUSE-SU-2025:20136-1"],"database_specific":{"cwe_ids":["CWE-787"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/40xxx/CVE-2023-40547.json","cna_assigner":"redhat"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2024/01/26/1"},{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1834"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1835"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1873"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1876"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1883"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1902"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1903"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1959"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:2086"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2023-40547"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/40xxx/CVE-2023-40547.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-40547"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2234589"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rhboot/shim","events":[{"introduced":"0"},{"fixed":"5914984a1ffeab841f482c791426d7ca9935a5e6"}],"database_specific":{"cpe":"cpe:2.3:a:redhat:shim:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"15.8"}],"source":"CPE_RANGE"}}],"versions":["15.7","15.6","15.6-rc2","15.5","15.5-rc2","15.4","15.3","shim-15.3-rc4","shim-15.3-rc3","shim-15.3-rc2","shim-15.3-rc1","15.2","15","14","13","12","11","0.9","0.8","0.7","0.5","0.4","0.3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-40547.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H"}]}