{"id":"CVE-2026-11604","title":"An incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win version 2.0.0 through 2.8.3 allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted dat…","summary":"An incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win version 2.0.0 through 2.8.3 allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted dat…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-122","CWE-131","CWE-787"],"vendor":"openvpn","product":"ovpn-dco-win","affected":["ovpn-dco-win >= 2.0.0, <= 2.8.3"],"published":"2026-06-10","updated":"2026-09-24","sourceUpdated":"2026-09-24T14:39:22.383","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-11604","references":[{"url":"https://community.openvpn.net/Security%20Announcements/CVE-2026-11604","label":"security@openvpn.net"},{"url":"https://github.com/OpenVPN/ovpn-dco-win/releases","label":"security@openvpn.net"}],"tags":["nvd"],"epss":0.00338,"epssPercentile":0.27341,"ingestedAt":"2026-09-24T14:44:21.301Z","slug":"CVE-2026-11604","body":"## Overview\n\nAn incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win version 2.0.0 through 2.8.3 allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted data packet, resulting in a system crash (denial of service).\n\n## Affected\n\n- `ovpn-dco-win >= 2.0.0, <= 2.8.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}