Vulnerability Analysis
Kernel memory disclosure and denial of service in MikroTik RouterOS btest service
CVE-2026-67277
RouterOS accepts a "related" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With "random-data=false", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel. This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)
CISA KEV
SSVC: Active Exploitation
Automatable
CVSS Base Score
8.8
HIGH
Exploitability:-
Impact Score:-
Temporal Score:-
EPSS:0.43%
Threat Intelligence Signals
CISA KEV
YES
KEV Date Added
2026-09-10
Ransomware Use
Unknown
KEV Due Date
2026-09-13
VulnCheck In-the-Wild
No
Nuclei Template
No
EPSS Score
0.435%
EPSS Percentile
36.7th pct
GHSA ID
GitHub Severity
HIGH
SSVC Exploitation
Active
SSVC Automatable
Yes
Vulnerability Class
—
Identity & Timeline
| Status | - |
| Assigning Authority | - |
| Discovered Via | - |
| Record Completeness | - |
| CVSS Version / Source | - |
| Reserved | - |
| Published | - |
| Patch Date (date_public) | - |
| Exploit DB Date | - |
| First GitHub PoC Date | - |
| Last Updated | - |
| Time to Patch (Days to fix) | - |
| Exploit Release Gap | - |
| PoC Release Gap | - |
| Exploit DB References | None identified |
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| No affected products specified. | ||
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