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Critical · 9.2 Exploited (EU) Public exploit CVE-2026-67276 EUVD-2026-72024GHSA-j9wg-77fw-f22f

SSH user impersonation possible in Mikrotik RouterOS

Published Sep 5, 2026 · Updated Sep 9, 2026 · Assigned by CERT-PL

Vendor: MikroTik Product: RouterOS Category: Network devices

Description

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)

Affected products

VendorProductAffectedFixed
Mikrotik RouterOS 7.24 – < 7.24.2, 7.9 – < 7.23.4 7.24.2

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 4 repositories

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 2

References