CVE-2026-67276: falha crítica em Mikrotik RouterOS
SSH user impersonation possible in Mikrotik RouterOS
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75Vexday Risk Score
Priorize a correção. Ela exploração observada pelo VulnCheck, tem alerta oficial do governo brasileiro e tem prova de conceito pública.
ssvc Actcvss 9.2epss 8.9%
da publicação à arma1 dia
Publicada no NVD5 de set.
1ª PoC+1d
VulnCheck5 de set.
Alerta oficial no Brasil
O governo federal publicou alerta, recomendação ou boletim que cita esta vulnerabilidade.
- CISC Gov.br · 09 set 2026Boletim do CISC de Vulnerabilidadesler no gov.br ↗
Fonte: CTIR Gov (GSI) e CISC Gov.br, sob licença CC BY-ND 3.0.
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)
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
Produtos afetados
Mikrotik · RouterOSPoCs públicas encontradas — 10
githubgithub.com/dinosn/mikrotrick-poc★ 102githubgithub.com/BlackHatExploitation/exploit-mikrotik-2026★ 14githubgithub.com/4rt-Net/Mikrotrick_POC★ 2githubgithub.com/HORKimhab/CVE-2026-67276★ 1vulncheckvulncheck.com/xdb/a6d3d0e78235não verificadocve_referencenpratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/não verificadovulncheckvulncheck.com/xdb/198acb5bb0b5não verificadovulncheckvulncheck.com/xdb/1d3caaa6186cnão verificadovulncheckvulncheck.com/xdb/03b9f37c1966não verificadovulncheckvulncheck.com/xdb/bcce7871500anão verificado⚠ Recursos públicos, para você avaliar a exposição de sistemas que controla ou está autorizado a testar. Teste apenas com autorização.
CVEs relacionadas — Mikrotik RouterOS
No mesmo produto, das mais perigosas para as menos.
CVE-2026-86060CRITICALSSH session privilege manipulation via a crafted username in Mikrotik RouterOSEPSS 6.4%KEVCVE-2026-67279MEDIUMSSH Pre-Authentication Rekey State Bypass in MikroTik RouterOSEPSS 2.3%KEVCVE-2026-67277HIGHKernel memory disclosure and denial of service in MikroTik RouterOS btest serviceEPSS 1.6%KEVCVE-2026-67281HIGHUnauthenticated file read in Mikrotik RouterOSEPSS 0.7%CVE-2023-32154HIGHMikrotik RouterOS RADVD Out-Of-Bounds Write Remote Code Execution VulnerabilityEPSS 0.6%CVE-2025-6443HIGHMikrotik RouterOS VXLAN Source IP Improper Access Control VulnerabilityEPSS 0.6%
Referências
https://cert.pl/en/posts/2026/09/mikrotik-routeros-cvehttps://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800https://mikrotik.com/supportsec/september-2026-vulnerability/https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/