EUVD-2026-72027
GHSA-pqp3-gjgf-83cf
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
PR:N confirmed by the auth-bypass nature; C:H because support output files contain full configuration and credential-adjacent data; I:L since writes affect the file namespace but not the running configuration directly.
Primary rating from Vendor (CERT-PL).
CVSS VectorVendor: CERT-PL
Lifecycle Timeline
4DescriptionCVE.org
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)
AnalysisAI
SSH authentication bypass in MikroTik RouterOS allows any unauthenticated network attacker to skip the entire SSH user-authentication phase by triggering a client-requested rekey, causing the server to advance directly into the connection protocol and accept session channel and exec requests. The result is unauthenticated file creation, overwrite, and exfiltration within the RouterOS managed file namespace - including support bundles containing configuration and diagnostic data. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | SSH service must be enabled and network-reachable on the target RouterOS device; SSH is enabled by default in RouterOS and is commonly exposed on management or WAN interfaces. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) confirms fully remote, unauthenticated, zero-complexity exploitation with no required network positioning or user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade RouterOS immediately to 6.49.21 (Long-term), 7.23.4 (Long-term), or 7.24.2 (Stable) as directed by the MikroTik advisory at https://mikrotik.com/supportsec/september-2026-vulnerability/. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same technique Authentication Bypass
View allVendor StatusVendor
SUSE
| Product | Status |
|---|---|
| openSUSE Tumbleweed | Fixed |
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