{"id":"CVE-2026-25791","state":"PUBLISHED","title":"Sliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of Service","description":"Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to 1.7.0, the DNS C2 listener accepts unauthenticated TOTP bootstrap messages and allocates server-side DNS sessions without validating OTP values, even when EnforceOTP is enabled. Because sessions are stored without a cleanup/expiry path in this flow, an unauthenticated remote actor can repeatedly create sessions and drive memory exhaustion. This vulnerability is fixed in 1.7.0.","publishedAt":"2026-02-09T20:34:31.144Z","updatedAt":"2026-02-10T15:59:20.819Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["BishopFox sliver"],"affected":[{"vendor":"BishopFox","product":"sliver","versions":[{"version":"< 1.7.0","status":"affected"}]}],"references":["https://github.com/BishopFox/sliver/security/advisories/GHSA-wxrw-gvg8-fqjp","https://github.com/BishopFox/sliver/releases/tag/v1.7.0"],"weaknesses":["CWE-306","CWE-400"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/25xxx/CVE-2026-25791.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-25791","state":"PUBLISHED","datePublished":"2026-02-09T20:34:31.144Z","dateUpdated":"2026-02-10T15:59:20.819Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-05T19:58:01.639Z"},"containers":{"cna":{"title":"Sliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of Service","descriptions":[{"lang":"en","value":"Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to 1.7.0, the DNS C2 listener accepts unauthenticated TOTP bootstrap messages and allocates server-side DNS sessions without validating OTP values, even when EnforceOTP is enabled. Because sessions are stored without a cleanup/expiry path in this flow, an unauthenticated remote actor can repeatedly create sessions and drive memory exhaustion. This vulnerability is fixed in 1.7.0."}],"affected":[{"vendor":"BishopFox","product":"sliver","versions":[{"version":"< 1.7.0","status":"affected"}]}],"references":[{"url":"https://github.com/BishopFox/sliver/security/advisories/GHSA-wxrw-gvg8-fqjp","name":"https://github.com/BishopFox/sliver/security/advisories/GHSA-wxrw-gvg8-fqjp","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/BishopFox/sliver/releases/tag/v1.7.0","name":"https://github.com/BishopFox/sliver/releases/tag/v1.7.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-306","lang":"en","description":"CWE-306: Missing Authentication for Critical Function","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-02-09T20:34:31.144Z"},"source":{"advisory":"GHSA-wxrw-gvg8-fqjp","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-10T15:39:42.592936Z","id":"CVE-2026-25791","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-10T15:59:20.819Z"}}]}}}