Vulnerability Intelligence Report
SSH user impersonation possible in Mikrotik RouterOS
CVE-2026-67276
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)
No Active Exploit Signals
CVSS Base Score
9.2
CRITICAL
EPSS Probability:0.24%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-347 ↗CWE-347 Improper verification of cryptographic signature
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Mikrotik | RouterOS | 7.24 < 7.24.2 (affected), 7.9 < 7.23.4 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.243%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | CERT.PL · CERT · Poland |
| Reserved | 2026-07-29T11:59:30 |
| Published | 2026-09-05T20:00:55 |
| Patch Date | 2026-09-05 |
| Last Updated | 2026-09-09T04:26:19 |
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