{"id":"CVE-2026-125406","state":"PUBLISHED","title":"Ettercap through 0.8.4.1 Stack Buffer Underwrite via Telnet Dissector Backspace Handling","description":"Ettercap through 0.8.4.1 contains a stack buffer underwrite vulnerability in the telnet dissector in src/dissectors/ec_telnet.c that decrements the output pointer on backspace without a lower bound check. Attackers can send a telnet stream with more backspaces than preceding characters to write below the stack buffer, corrupting the stack of the Ettercap process that normally runs as root.","publishedAt":"2026-11-09T23:28:07.044Z","updatedAt":"2026-11-09T23:28:07.044Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["Ettercap ettercap"],"affected":[{"vendor":"Ettercap","product":"ettercap","packageURL":"pkg:github/Ettercap/ettercap","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.8.4.1","versionType":"custom"}],"repo":"https://github.com/Ettercap/ettercap"}],"references":["https://github.com/Ettercap/ettercap/security/advisories/GHSA-w5ch-7c4x-crcc","https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98","https://github.com/Ettercap/ettercap/pull/1330","https://github.com/Ettercap/ettercap/blob/v0.8.4.1/src/dissectors/ec_telnet.c#L150-L159","https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-stack-buffer-underwrite-via-telnet-dissector-backspace-handling"],"weaknesses":["CWE-124"],"ingestedAt":"2026-11-09T23:36:06.628Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/125xxx/CVE-2026-125406.json","commit":"b5e35fd13cceb3fc2d7ace24f43c95cd80e7dc5f","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-125406","state":"PUBLISHED","datePublished":"2026-11-09T23:28:07.044Z","dateUpdated":"2026-11-09T23:28:07.044Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-11-09T22:03:17.371Z"},"containers":{"cna":{"title":"Ettercap through 0.8.4.1 Stack Buffer Underwrite via Telnet Dissector Backspace Handling","descriptions":[{"lang":"en","value":"Ettercap through 0.8.4.1 contains a stack buffer underwrite vulnerability in the telnet dissector in src/dissectors/ec_telnet.c that decrements the output pointer on backspace without a lower bound check. Attackers can send a telnet stream with more backspaces than preceding characters to write below the stack buffer, corrupting the stack of the Ettercap process that normally runs as root."}],"affected":[{"vendor":"Ettercap","product":"ettercap","packageURL":"pkg:github/Ettercap/ettercap","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.8.4.1","versionType":"custom"}],"repo":"https://github.com/Ettercap/ettercap"}],"references":[{"url":"https://github.com/Ettercap/ettercap/security/advisories/GHSA-w5ch-7c4x-crcc","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-w5ch-7c4x-crcc)"},{"url":"https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98","tags":["patch"]},{"url":"https://github.com/Ettercap/ettercap/pull/1330","tags":["issue-tracking","patch"]},{"url":"https://github.com/Ettercap/ettercap/blob/v0.8.4.1/src/dissectors/ec_telnet.c#L150-L159","tags":["technical-description"]},{"url":"https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-stack-buffer-underwrite-via-telnet-dissector-backspace-handling","name":"VulnCheck Advisory: Ettercap through 0.8.4.1 Stack Buffer Underwrite via Telnet Dissector Backspace Handling","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-124","lang":"en","description":"Buffer Underwrite ('Buffer Underflow')","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-11-09T23:28:07.044Z"},"datePublic":"2026-11-06T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:ettercap-project:ettercap:*:*:*:*:*:*:*:*","versionEndIncluding":"0.8.4.1"}]}]}],"credits":[{"lang":"en","value":"Adiel Sol, Arad Inbar, Erez Cohen, Nir Somech, Ben Grinberg, Daniel Lubel, Shir Sadon (DREAM Security Research Team)","type":"finder"},{"lang":"en","value":"Emilio Escobar","type":"remediation developer"}],"x_generator":{"engine":"vulncheck-endgame"}}}}}