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KEV Entry

CVE-2026-67277

Known Exploited Vulnerability Entry ENISA

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Entry Details
Confirmed Exploited

CVE-2026-67277

2026-09-05 00:00 UTC

Timestamps

2026-09-05

2026-09-05

Scope

MikroTrick | Affected: MikroTik / RouterOS | Description: 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) | Patched since: 2026/09/03 | Exploitation type: unknown | CWEs: CWE-306 | Origin source: CERT.PL | Notes: https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/

References
  • {'id': 'CVE-2026-67277', 'url': 'https://www.cve.org/CVERecord?id=CVE-2026-67277'}
  • {'id': 'EUVD-2026-72025', 'url': 'https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-72025'}
  • {'id': 'source', 'url': 'https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/'}

1d9ea784-c941-41ec-aa5f-c1cb172bcb68

ENISA
cce329bf-df49-4c6e-a027-80be2e6483bd

2026-09-05 22:00 UTC

2026-09-05 22:00 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
csirt_report enisa-cnw-kev successful_exploitation 0.75
View details 
{
  "catalog": "ENISA / EU CSIRTs Network (CNW) KEV JSON",
  "cwes": [
    "CWE-306"
  ],
  "dateReported": "2026/09/05",
  "euvd": "EUVD-2026-72025",
  "exploitationType": [
    "unknown"
  ],
  "notes": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/",
  "originSource": "CERT.PL",
  "patchedSince": "2026/09/03",
  "product": "RouterOS",
  "threatActorsExploiting": [],
  "vendorProject": "MikroTik",
  "vulnerabilityName": "MikroTrick"
}
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