{"id":"CVE-2026-67276","published":"2026-09-05T20:00:55Z","modified":"2026-09-09T04:26:19Z","title":"SSH user impersonation possible in Mikrotik RouterOS","vendor":"Mikrotik","product":"RouterOS","tier":"core","eol":null,"affectedVersions":[{"vendor":"Mikrotik","product":"RouterOS","versions":[">= 7.24, < 7.24.2",">= 7.9, < 7.23.4"]}],"description":{"text":"RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key, checking the key type and modulus but omitting the exponent. Because signature verification uses the client-supplied key, an attacker knowing an authorized RSA modulus can supply a key with exponent one, forge a valid signature, and open an SSH command channel as the target user without the private key.This issue affects only 7.x branch was fixed in versions: 7.23.4 (Long-term) and 7.24.2 (Stable)","provenance":"source","from":"CVE.org"},"summary":{"text":"Mikrotik RouterOS fails to compare the complete RSA public key during SSH authentication, allowing an attacker who knows an authorized RSA modulus to forge a signature and open an SSH command channel as the target user without the private key. This affects only the 7.x branch and was fixed in versions 7.23.4 (Long-term) and 7.24.2 (Stable).","provenance":"ai","model":"deepseek-v4-flash","generatedAt":"2026-10-23T03:20:16Z"},"cvss":{"score":9.2,"severity":"CRITICAL","version":"4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.08943,"percentile":0.95245,"date":"2026-10-31","provenance":"source"},"kev":null,"vulncheckKev":{"dateAdded":"2026-09-05","exploitedFirstSeen":"2026-09-05","ransomware":false,"evidence":[{"url":"https://euvd.enisa.europa.eu/enisa/EUVD-2026-72024","date":"2026-09-05"},{"url":"https://www.socdefenders.ai/item/68ceafdc-8b37-4816-acb6-8066b031e965","date":"2026-09-05"},{"url":"https://www.acn.gov.it/portale/w/mikrotik-rilevato-sfruttamento-in-rete-di-nuove-vulnerabilita","date":"2026-09-06"},{"url":"https://www.linkedin.com/posts/omar-ahmed-le0mx_mikrotik-networksecurity-vulnerability-activity-7502362565193211904-TZgz/","date":"2026-09-06"},{"url":"https://cydome.io/maritime-cybersecurity-bulletin-september-11th-2026/","date":"2026-09-11"}],"evidenceTotal":5,"provenance":"source"},"exploited":true,"otx":null,"cwes":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"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":["technical-description"]},{"url":"https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/","tags":["exploit"]},{"url":"https://mikrotik.com/supportsec/september-2026-vulnerability/","tags":["vendor-advisory"]},{"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"]}],"techniques":[],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-72024","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-72024","exploited":true,"exploitedSince":"2026-09-05","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":4,"skipped":0,"earliest":"2026-09-06","earliestUrl":"https://github.com/HORKimhab/CVE-2026-67276","repos":[{"name":"dinosn/mikrotrick-poc","url":"https://github.com/dinosn/mikrotrick-poc","stars":102,"created":"2026-09-06"},{"name":"BlackHatExploitation/exploit-mikrotik-2026","url":"https://github.com/BlackHatExploitation/exploit-mikrotik-2026","stars":14,"created":"2026-09-07"},{"name":"4rt-Net/Mikrotrick_POC","url":"https://github.com/4rt-Net/Mikrotrick_POC","stars":2,"created":"2026-09-09"},{"name":"HORKimhab/CVE-2026-67276","url":"https://github.com/HORKimhab/CVE-2026-67276","stars":1,"created":"2026-09-06"}]},"first":{"date":"2026-09-06","source":"PoC-in-GitHub","url":"https://github.com/HORKimhab/CVE-2026-67276"},"provenance":"source"},"exploitRefs":["https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/"],"flow":[],"timeline":[{"date":"2026-09-05","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2026-67276","provenance":"source"},{"date":"2026-09-05","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://euvd.enisa.europa.eu/enisa/EUVD-2026-72024","provenance":"source"},{"date":"2026-09-05","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-72024","provenance":"source"},{"date":"2026-09-06","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/HORKimhab/CVE-2026-67276","provenance":"source"}],"speed":{"daysToPublicExploit":1,"firstExploitFrom":"PoC-in-GitHub","daysToKev":null},"priority":{"score":75.5,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in VulnCheck KEV"},{"name":"Recent KEV listing","points":10.0,"detail":"added 57 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.05,"detail":"percentile 0.9525"},{"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":0.0,"detail":"0 pulses"},{"name":"CVSS severity","points":6.44,"detail":"base score 9.2"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}