{"id":"CVE-2026-67279","aliases":["EUVD-2026-72027","GHSA-pqp3-gjgf-83cf","openSUSE-SU-2026:11737-1"],"status":"published","title":"SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS","description":"RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.02277,"percentile":0.8326,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":true},"cwes":["CWE-841"],"published":"2026-09-05T20:00:57Z","modified":"2026-09-26T04:17:47Z","kev":{"date_added":"2026-09-25","due_date":"2026-09-28","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2026-09-25"},{"source":"kev","since":"2026-09-25"}],"exploits":[{"source":"pocgithub","id":"HackSpeak/CVE-2026-67279","title":"HackSpeak/CVE-2026-67279","date":"2026-09-26","url":"https://github.com/HackSpeak/CVE-2026-67279"},{"source":"pocgithub","id":"tc4dy/CVE-2026-67279-86060-Toolkit","title":"tc4dy/CVE-2026-67279-86060-Toolkit","date":"2026-09-27","url":"https://github.com/tc4dy/CVE-2026-67279-86060-Toolkit"},{"source":"pocgithub","id":"shmaki4/CVE-2026-67279-Mikrotik-6.42-POC","title":"shmaki4/CVE-2026-67279-Mikrotik-6.42-POC","date":"2026-10-08","url":"https://github.com/shmaki4/CVE-2026-67279-Mikrotik-6.42-POC"},{"source":"pocgithub","id":"GoldAden/mikrotrick-verifier","title":"GoldAden/mikrotrick-verifier","date":"2026-10-17","url":"https://github.com/GoldAden/mikrotrick-verifier"}],"fixes":[{"ecosystem":"openSUSE:Tumbleweed","package":"sshamble","fixed_in":["0.3.12-1.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"sshamble","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.12-1.1"}]}]}],"products":[{"vendor":"mikrotik","product":"routeros"}],"references":[{"url":"https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve","tags":["third-party-advisory","Third Party Advisory"]},{"url":"https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/","tags":["technical-description","Mitigation","Third Party Advisory"]},{"url":"https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/","tags":["exploit","Exploit","Third Party Advisory"]},{"url":"https://mikrotik.com/supportsec/september-2026-vulnerability/","tags":["vendor-advisory","Vendor Advisory"]},{"url":"https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802","tags":["release-notes","Release Notes"]},{"url":"https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801","tags":["release-notes","Release Notes"]},{"url":"https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800","tags":["release-notes","Release Notes"]},{"url":"https://bishopfox.com/blog/mikrotrick-inside-the-routeros-takeover-chain","tags":["third-party-advisory","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67279","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67279"},{"url":"https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited"},{"url":"https://mikrotik.com/supportsec/september-2026-vulnerability"},{"url":"https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain"},{"url":"https://github.com/advisories/GHSA-pqp3-gjgf-83cf"},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-67279","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-67279","title":"SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS","description":"RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)","status":"published","published":"2026-09-05T20:00:57.894Z","modified":"2026-09-26T03:55:45.145Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-841"],"updated_at":"2026-11-02T14:20:06.562031Z"}],"euvd":[{"id":"EUVD-2026-72027","description":"RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)","status":"published","published":"2026-09-05T20:00:57Z","modified":"2026-09-26T03:55:45Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"exploited_since":"2026-09-25","updated_at":"2026-11-02T17:27:54.622662Z"}],"ghsa":[{"id":"GHSA-pqp3-gjgf-83cf","title":"RouterOS SSH enters the connection protocol after a client-requested rekey even though user...","description":"RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)","status":"published","published":"2026-09-05T21:31:20Z","modified":"2026-09-25T18:32:21Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-841"],"updated_at":"2026-11-02T15:12:27.190195Z"}],"kev":[{"id":"CVE-2026-67279","title":"Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability","description":"Mikrotik RouterOS contains an improper enforcement of behavioral workflow vulnerability that could allow an unauthenticated client to open a session channel and send an exec request. This vulnerability can be chained to achieve unauthenticated exploitation of CVE-2026-86060.","cwes":["CWE-841"],"kev":{"date_added":"2026-09-25","due_date":"2026-09-28","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:15.999436Z"}],"nvd":[{"id":"CVE-2026-67279","description":"RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)","status":"published","published":"2026-09-05T20:17:18.39Z","modified":"2026-09-26T04:17:47.273Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-841"],"updated_at":"2026-11-02T14:12:44.082631Z"}],"osv":[{"id":"openSUSE-SU-2026:11737-1","title":"sshamble-0.3.12-1.1 on GA media","description":"These are all security issues fixed in the sshamble-0.3.12-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-09-09T00:00:00Z","modified":"2026-09-10T18:23:18.758052114Z","updated_at":"2026-11-02T16:58:39.516824Z"}]}}