SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mikrotik | RouterOS | unaffected |
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Configuration 1 [-]
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No data.
| Vendor | Product | Versions | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mikrotik | Routeros |
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No CVSS v3.0
No CVSS v2
This CVE is in the KEV database since Sept. 25, 2026.
Exploit prediction score: 2.3% (2.277% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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ssvc
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|---|---|---|
| References |
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| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
kev
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| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:* | |
| Metrics |
cvssV3_1
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| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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| Description | 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 (Lont-term), 7.23.4 (Lont-term) and 7.24.2 (Stable) | 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) |
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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 (Lont-term), 7.23.4 (Lont-term) and 7.24.2 (Stable) | |
| Title | SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS | |
| First Time appeared |
Mikrotik
Mikrotik routeros |
|
| Weaknesses | CWE-841 | |
| CPEs | cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Mikrotik
Mikrotik routeros |
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| References |
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| Metrics |
cvssV4_0
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