high Known exploitedREV. 01
CVE-2026-67277MikroTik RouterOS — Unauthenticated btest Kernel Memory Leak and Crash
MikroTik RouterOS accepts a related bandwidth-test (btest) connection before its primary session has logged in. An unauthenticated client can start a test that leaks uninitialized kernel memory, and a size underflow can restart the router's kernel. Exploited in the wild.
Read the risk
THE VITAL STATS- CVSS score
- 8.2/ 10 CVSS v3.1
- EPSS probability
- 1% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2026-09-05
- Added to KEV
- 2026-09-10
- Exploit published
- Yes
- Confidence
- high
- Kill chain
- impact
- MITRE ATT&CK
- T1190, T1499
- Severity
- high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Attacker needsNetwork access to the RouterOS bandwidth-test (btest) service; no credentials or user interaction needed
Fixed inrouteros 6.49.21 (long-term), routeros 7.23.4 (long-term), routeros 7.24.2 (stable)
Behind the card
5 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorycert.plcert.pl
- 04Vendor advisorymikrotik.commikrotik.com
- 05Exploitnpratley.netnpratley.net
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-20 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-20 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-20 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-20 | claude-code | high |
| exploitation.prerequisites | nvd.nist.gov | 2026-09-20 | human | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.