Answer in brief
CVE-2026-67277 records a Unknown severity vulnerability in Kernel memory disclosure and denial of service in MikroTik RouterOS btest service. The current sources do not mark it as known exploited. The current feed maps Mikrotik/RouterOS (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Mikrotik/RouterOS (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Mikrotik/RouterOSgeneric | >=7.24 <7.24.2 || >=7.0.0 <7.23.4 || >=6.0.0 <6.49.21 | 7.24.2, 7.23.4, 6.49.21 |
Published upstream
Sep 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 5, 2026
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 (Lont-term), 7.23.4 (Lont-term) and 7.24.2 (Stable)
Quoted source text, attributed separately from HOL analysis.