CVE-2026-67277: Mikrotik RouterOS

Kernel memory disclosure and denial of service in MikroTik RouterOS btest service

CVSS 8.8 HighCriticalIn CISA KEVEPSS 0.016 · 75th percentile

Critical, because:

In CISA’s KEV catalogue since 10 Sept 2026: it is known to be exploited.

Published by the CVE Program (CNA: CERT-PL) at 5 Sept 2026, 20:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Mikrotik	RouterOS	affected 7.24 to before 7.24.2 custom affected 7.0.0 to before 7.23.4 custom affected 6.0.0 to before 6.49.21 custom Other versions: unaffected

Identifiers

CVE-2026-67277

CNA

CERT-PL

Weakness (CWE)

CWE-306

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.8	High	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N	CNA (CERT-PL)

CISA KEV Listed since 10 Sept 2026: known to be exploited.
EPSS 0.016, the 75th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 5 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

cert.pl/en/posts/2026/09/mikrotik-routeros-cve third-party-advisory
cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/ technical-description
mikrotik.com/supportsec/september-2026-vulnerability/ vendor-advisory
forum.mikrotik.com/t/6-49-21-long-term-is-released/272802 release-notes
forum.mikrotik.com/t/7-23-4-long-term-is-released/272801 release-notes
forum.mikrotik.com/t/7-24-2-stable-is-released/272800 release-notes
npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/ exploit

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.