{"id":"CVE-2026-67279","published":"2026-09-05T20:17:18Z","modified":"2026-09-26T04:17:47Z","title":"Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability","vendor":"MikroTik","product":"RouterOS","tier":"core","eol":null,"description":{"text":"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)","provenance":"source","from":"NVD"},"summary":{"text":"MikroTik RouterOS has a flaw in its SSH service: after a client-requested rekey, the server enters the connection protocol without ever requiring user authentication, which is an improper enforcement of behavioral workflow. An unauthenticated remote client can exploit this over the network, with no user interaction or prior credentials needed, to open a session channel and send an exec request, letting it create, overwrite, and reconstruct files in RouterOS's managed file namespace, including support files holding configuration and diagnostic data, on affected builds.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:14:37Z"},"cvss":{"score":6.5,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.02277,"percentile":0.83093,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2026-09-25","dueDate":"2026-09-28","ransomware":false,"requiredAction":"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.","notes":"https://mikrotik.com/supportsec/september-2026-vulnerability ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-67279","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-09-05","exploitedFirstSeen":"2026-09-05","ransomware":false,"evidence":[{"url":"https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/","date":"2026-09-05"},{"url":"https://cert.pl/en/posts/2026/09/mikrotrick-technical-analysis/","date":"2026-09-22"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-09-25"}],"evidenceTotal":3,"provenance":"source"},"exploited":true,"otx":{"pulseCount":29,"pulses":[{"name":"Actively_Exploited_Kev | Oct 31, 2026","url":"https://otx.alienvault.com/pulse/6ae4aefab0c2191cecd41862","created":"2026-10-30"},{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"}],"provenance":"machine"},"cwes":[{"id":"CWE-841","name":"Improper Enforcement of Behavioral Workflow"}],"references":[{"url":"https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve","tags":["Third Party Advisory"]},{"url":"https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/","tags":["Mitigation","Third Party Advisory"]},{"url":"https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802","tags":["Release Notes"]},{"url":"https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801","tags":["Release Notes"]},{"url":"https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800","tags":["Release Notes"]},{"url":"https://mikrotik.com/supportsec/september-2026-vulnerability/","tags":["Vendor Advisory"]},{"url":"https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/","tags":["Exploit","Third Party Advisory"]},{"url":"https://bishopfox.com/blog/mikrotrick-inside-the-routeros-takeover-chain","tags":["Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67279","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: unauthenticated remote SSH exploitation of public-facing service","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"allowing an unauthenticated client to open a session channel and send an exec request","start":128,"end":213}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: server dispatches attacker-supplied exec request commands","mappingType":"primary_impact","evidence":[{"from":"description","quote":"the server dispatches the command, enabling unauthenticated creation, overwrite","start":234,"end":313}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1565.001","name":"Stored Data Manipulation","tactics":["impact"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: overwrite and reconstruction of stored files","mappingType":"primary_impact","evidence":[{"from":"description","quote":"enabling unauthenticated creation, overwrite, and reconstruction of files","start":269,"end":342}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-72027","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-72027","exploited":true,"exploitedSince":"2026-09-25","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":4,"skipped":0,"earliest":"2026-09-26","earliestUrl":"https://github.com/HackSpeak/CVE-2026-67279","repos":[{"name":"tc4dy/CVE-2026-67279-86060-Toolkit","url":"https://github.com/tc4dy/CVE-2026-67279-86060-Toolkit","stars":7,"created":"2026-09-27"},{"name":"HackSpeak/CVE-2026-67279","url":"https://github.com/HackSpeak/CVE-2026-67279","stars":5,"created":"2026-09-26"},{"name":"shmaki4/CVE-2026-67279-Mikrotik-6.42-POC","url":"https://github.com/shmaki4/CVE-2026-67279-Mikrotik-6.42-POC","stars":1,"created":"2026-10-08"},{"name":"GoldAden/mikrotrick-verifier","url":"https://github.com/GoldAden/mikrotrick-verifier","stars":0,"created":"2026-10-17"}]},"first":{"date":"2026-09-26","source":"PoC-in-GitHub","url":"https://github.com/HackSpeak/CVE-2026-67279"},"provenance":"source"},"exploitRefs":["https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/"],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1059","T1565.001"],"provenance":"ai"}],"timeline":[{"date":"2026-09-05","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67279","provenance":"source"},{"date":"2026-09-05","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/","provenance":"source"},{"date":"2026-09-25","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2026-09-25","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-72027","provenance":"source"},{"date":"2026-09-26","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/HackSpeak/CVE-2026-67279","provenance":"source"}],"speed":{"daysToPublicExploit":21,"firstExploitFrom":"PoC-in-GitHub","daysToKev":20},"priority":{"score":74.2,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":10.0,"detail":"added 56 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":16.62,"detail":"percentile 0.8309"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit; 4 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"29 pulses"},{"name":"CVSS severity","points":4.55,"detail":"base score 6.5"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}