{"id":"CVE-2026-23567","state":"PUBLISHED","title":"Integer underflow in Content Distribution Service UDP handler","description":"An integer underflow in the UDP command handler of the TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an adjacent network attacker to trigger a heap-based buffer overflow and cause a denial-of-service (service crash) via specially crafted UDP packets.","publishedAt":"2026-01-29T08:47:13.169Z","updatedAt":"2026-01-29T16:44:12.331Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"TV"},"assigner":"TV","products":["TeamViewer DEX"],"affected":[{"vendor":"TeamViewer","product":"DEX","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"26.1","versionType":"custom"}],"modules":["Content Distribution Service","NomadBranch.exe"],"platforms":["Windows"]}],"references":["https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001/"],"weaknesses":["CWE-122"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23567.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23567","state":"PUBLISHED","datePublished":"2026-01-29T08:47:13.169Z","dateUpdated":"2026-01-29T16:44:12.331Z","assignerShortName":"TV","assignerOrgId":"13430f76-86eb-43b2-a71c-82c956ef31b6","dateReserved":"2026-01-14T13:54:40.322Z"},"containers":{"cna":{"title":"Integer underflow in Content Distribution Service UDP handler","descriptions":[{"lang":"en","value":"An integer underflow in the UDP command handler of the TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an adjacent network attacker to trigger a heap-based buffer overflow and cause a denial-of-service (service crash) via specially crafted UDP packets."}],"affected":[{"vendor":"TeamViewer","product":"DEX","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"26.1","versionType":"custom"}],"modules":["Content Distribution Service","NomadBranch.exe"],"platforms":["Windows"]}],"references":[{"url":"https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001/"}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","description":"CWE-122 Heap-based Buffer Overflow","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"TV","orgId":"13430f76-86eb-43b2-a71c-82c956ef31b6","dateUpdated":"2026-01-29T08:47:13.169Z"},"credits":[{"lang":"en","type":"finder","value":"Threat Hunt Team of Bank of America"}],"impacts":[{"capecId":"CAPEC-100","descriptions":[{"lang":"en","value":"CAPEC-100 Overflow Buffers"}]}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Update the TeamViewer DEX Client (1E Client) to the latest available version."}],"value":"Update the TeamViewer DEX Client (1E Client) to the latest available version."}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.5.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-01-29T15:56:32.513279Z","id":"CVE-2026-23567","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":"2026-01-29T16:44:12.331Z"}}]}}}