{"id":"CVE-2026-5039","state":"PUBLISHED","title":"Predictable Default Cryptographic Key Used for DES Encryption in TP-Link TL-WL841N","description":"TP-Link TL-WR841N v13 uses DES-CBC encryption in the TDDPv2 debug protocol with a cryptographic key derived from default web management credentials, making the key predictable if device is left in default configuration. A network-adjacent attacker can exploit this weakness to gain unauthorized access to the protocol, read debug data, modify certain device configuration values, and trigger device reboot, resulting in loss of integrity and a denial-of-service condition.","publishedAt":"2026-04-23T16:10:13.269Z","updatedAt":"2026-04-28T17:45:30.438Z","severity":{"score":6.1,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N","source":"TPLink"},"assigner":"TPLink","products":["TP-Link Systems Inc. TL-WL841N v13"],"affected":[{"vendor":"TP-Link Systems Inc.","product":"TL-WL841N v13","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.9.1 Build 20231120 Rel.62366","versionType":"custom"}]}],"references":["https://www.tp-link.com/us/support/download/tl-wr841n/v13/#Firmware"],"weaknesses":["CWE-1394"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/5xxx/CVE-2026-5039.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-5039","state":"PUBLISHED","datePublished":"2026-04-23T16:10:13.269Z","dateUpdated":"2026-04-28T17:45:30.438Z","assignerShortName":"TPLink","assignerOrgId":"f23511db-6c3e-4e32-a477-6aa17d310630","dateReserved":"2026-03-27T16:26:48.187Z"},"containers":{"cna":{"title":"Predictable Default Cryptographic Key Used for DES Encryption in TP-Link TL-WL841N","descriptions":[{"lang":"en","value":"TP-Link TL-WR841N v13 uses DES-CBC encryption in the TDDPv2 debug protocol with a cryptographic key derived from default web management credentials, making the key predictable if device is left in default configuration. A network-adjacent attacker can exploit this weakness to gain unauthorized access to the protocol, read debug data, modify certain device configuration values, and trigger device reboot, resulting in loss of integrity and a denial-of-service condition."}],"affected":[{"vendor":"TP-Link Systems Inc.","product":"TL-WL841N v13","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.9.1 Build 20231120 Rel.62366","versionType":"custom"}]}],"references":[{"url":"https://www.tp-link.com/us/support/download/tl-wr841n/v13/#Firmware","tags":["patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","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":6.1,"vectorString":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1394","lang":"en","description":"CWE-1394 Use of default cryptographic key","type":"CWE"}]}],"providerMetadata":{"shortName":"TPLink","orgId":"f23511db-6c3e-4e32-a477-6aa17d310630","dateUpdated":"2026-04-28T17:45:30.438Z"},"impacts":[{"capecId":"CAPEC-70","descriptions":[{"lang":"en","value":"CAPEC-70 Try Common or Default Usernames and Passwords"}]}],"credits":[{"lang":"en","value":"Ben Grinberg, Adiel Sol, Daniel Lubel, Erez Cohen, Nir Somech, Arad Inbar, Dream Group","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.1"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-23T17:38:11.142339Z","id":"CVE-2026-5039","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":"2026-04-23T17:40:28.657Z"}}]}}}