{"id":"CVE-2026-11771","details":"OpenVPN version 2.1.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows attackers via an off-by-one buffer write in the NTLM proxy authentication to potentially cause a crash via a crafted NTLM response from a malicious proxy server","modified":"2026-08-07T03:45:24.096013234Z","published":"2026-07-30T16:36:41.087Z","database_specific":{"cna_assigner":"OpenVPN","cwe_ids":["CWE-121","CWE-193","CWE-787"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11771.json","unresolved_ranges":[{"extracted_events":[{"introduced":"2.1.0"},{"last_affected":"2.6.20"},{"introduced":"2.7_alpha1"},{"last_affected":"2.7.4"}],"source":"AFFECTED_FIELD"},{"source":"DESCRIPTION","extracted_events":[{"introduced":"2.1.0"},{"fixed":"2.6.20"},{"introduced":"2.7_alpha1"},{"fixed":"2.7.4"}]}]},"references":[{"type":"ADVISORY","url":"https://community.openvpn.net/ReleaseHistory#openvpn-2621-released-1-july-2026"},{"type":"ADVISORY","url":"https://community.openvpn.net/ReleaseHistory#openvpn-275-released-1-july-2026"},{"type":"ADVISORY","url":"https://community.openvpn.net/Security%20Announcements/CVE-2026-11771"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11771.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-11771"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openvpn/openvpn","events":[{"introduced":"4580320b22946a1dd65039a6efcd616ee5e4ac3b"},{"fixed":"4dee614e4e799d6d4a20bffabd902291c86406f2"},{"introduced":"ee1577744fb09af760dc319d57746e6abc55db85"},{"fixed":"b25bb2a8bda814edab39b4246d4e296330a7a29e"}],"database_specific":{"cpe":"cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"2.1.0"},{"fixed":"2.6.21"},{"introduced":"2.7"},{"fixed":"2.7.5"}],"source":"CPE_RANGE"}}],"versions":["v2.6.20","v2.7.4","v2.7.3","v2.7.2","v2.7.1","v2.6.19","v2.7.0","v2.6.18","v2.6.17","v2.6.16","v2.6.15","v2.6.14","v2.6.13","v2.6.12","v2.6.11","v2.6.10","v2.6.9","v2.6.8","v2.6.7","v2.6.6","v2.6.5","v2.6.4","v2.6.3","v2.6.2","v2.6.1","v2.6.0","v2.6_rc2","v2.6_rc1","v2.6_beta2","v2.6_beta1","v2.4_rc2","v2.4_rc1","v2.4_beta2","v2.4_beta1","v2.4_alpha2","v2.4_alpha1","v2.3_beta1","v2.3_alpha3","v2.3_alpha2","v2.3-alpha1","v2.2-RC2","v2.2-RC","v2.2-beta5","v2.2-beta4","v2.1.3","v2.1.2","v2.1.1","v2.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11771.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"}]}