CVE-2026-67277High· 8.2▾ Abyssal⚠ Exploited in the wildPoC availableRouterOS 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 a…
▾ Abyssal zone — Critical with a public exploit or in-the-wild use
impact 45.1 · likelihood 0.2 · exploitation 25
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.4%
Federal remediation due Sep 13, 2026
Last analysed / modified upstream
Exploit / PoC code exists
8.8 → 8.2
8.2 → 8.8
8.8 → 8.2
0.4% → 0.9%
Added to the CISA catalog on Sep 10, 2026. Federal remediation due Sep 13, 2026. View catalog ↗
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)
routeros >= 6.0, < 6.49.21routeros >= 7.0, < 7.23.4routeros >= 7.24, < 7.24.2Upgrade past the affected range:
routeros 7.24.2Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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