{"id":"CVE-2026-11604","state":"PUBLISHED","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 buffe","description":"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 data packet, resulting in a system crash (denial of service).","publishedAt":"2026-06-10T21:04:37.141Z","updatedAt":"2026-06-11T13:27:17.336Z","severity":{"score":5.6,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","source":"OpenVPN"},"assigner":"OpenVPN","products":["OpenVPN ovpn-dco-win"],"affected":[{"vendor":"OpenVPN","product":"ovpn-dco-win","defaultStatus":"unaffected","versions":[{"version":"2.0.0","status":"affected","lessThanOrEqual":"2.5.8","versionType":"semver"}],"platforms":["Windows"]}],"references":["https://github.com/OpenVPN/ovpn-dco-win/releases","https://community.openvpn.net/Security%20Announcements/CVE-2026-11604"],"weaknesses":["CWE-131","CWE-122","CWE-787"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/11xxx/CVE-2026-11604.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-11604","state":"PUBLISHED","datePublished":"2026-06-10T21:04:37.141Z","dateUpdated":"2026-06-11T13:27:17.336Z","assignerShortName":"OpenVPN","assignerOrgId":"36a55730-e66d-4d39-8ca6-3c3b3017965e","dateReserved":"2026-06-08T15:19:28.369Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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 data packet, resulting in a system crash (denial of service)."}],"affected":[{"vendor":"OpenVPN","product":"ovpn-dco-win","defaultStatus":"unaffected","versions":[{"version":"2.0.0","status":"affected","lessThanOrEqual":"2.5.8","versionType":"semver"}],"platforms":["Windows"]}],"references":[{"url":"https://github.com/OpenVPN/ovpn-dco-win/releases","tags":["product"]},{"url":"https://community.openvpn.net/Security%20Announcements/CVE-2026-11604","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"HIGH","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":5.6,"vectorString":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-131","lang":"en","description":"CWE-131 Incorrect calculation of buffer size","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-122","lang":"en","description":"CWE-122 Heap-based buffer overflow","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-787","lang":"en","description":"CWE-787 Out-of-bounds write","type":"CWE"}]}],"providerMetadata":{"shortName":"OpenVPN","orgId":"36a55730-e66d-4d39-8ca6-3c3b3017965e","dateUpdated":"2026-06-10T21:04:37.141Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-11T13:26:56.757395Z","id":"CVE-2026-11604","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-11T13:27:17.336Z"}}]}}}