{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-120596","assignerOrgId":"37e5125f-f79b-445b-8fad-9564f167944b","state":"PUBLISHED","assignerShortName":"certcc","dateReserved":"2026-11-02T16:58:49.331Z","datePublished":"2026-11-02T17:04:18.611Z","dateUpdated":"2026-11-02T17:17:35.066Z"},"containers":{"cna":{"title":"CVE-2026-120596","descriptions":[{"lang":"en","value":"A remotely exploitable denial-of-service vulnerability exists in the TCP options parser of the Nut/Net TCP/IP stack included in Nut/OS, developed by Ethernut/Egnite. Nut/OS releases up to version 5.1 are affected. An unauthenticated attacker can send a single TCP segment containing an unknown TCP option with a length byte of zero to any open TCP port on a vulnerable device. When processed, this malformed option triggers an infinite loop in the function NutTcpInputOptions, permanently blocking the TCP processing thread and rendering all TCP-based services unresponsive until the device is rebooted."}],"source":{"discovery":"UNKNOWN"},"affected":[{"vendor":"Ethernut / egnite GmbH","product":"Nut/Net TCP/IP Stack","versions":[{"status":"affected","version":"Nut/OS 5.1"}]}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')"}]},{"descriptions":[{"lang":"en","description":"CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer"}]},{"descriptions":[{"lang":"en","description":"CWE-20 Improper Input Validation"}]}],"references":[{"url":"https://www.ethernut.de/en/download/index.html"}],"x_generator":{"engine":"VINCE 3.0.52","env":"prod","origin":"https://cveawg.mitre.org/api/cve/CVE-2026-120596"},"providerMetadata":{"orgId":"37e5125f-f79b-445b-8fad-9564f167944b","shortName":"certcc","dateUpdated":"2026-11-02T17:04:18.611Z"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-835","lang":"en","description":"CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-11-02T17:17:32.319063Z","id":"CVE-2026-120596","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-11-02T17:17:35.066Z"}}]}}