Vulnerability in Mikrotik Routeros
CVE-2026-93345
MikroTik RouterOS before 7.25beta4 contains an improper input validation vulnerability in the labelled-VPN NLRI iterators of the routing service that allows an unauthenticated on-path attacker to crash the BGP service by sending a malformed MP_REACH_NLRI UPDATE message with a prefix-length value below the minimum valid for a labelled-VPN NLRI, which passes validation while describing a route with a negative-length address portion. Attackers can repeatedly send a single BGP UPDATE packet carrying a VPNv4 or VPNv6 NLRI with an out-of-bounds prefix-length to indefinitely hold down the BGP plane, causing session termination without a NOTIFICATION and triggering a service malfunction on the device. The fix is carried only in 7.25beta4, a development build; the current stable release 7.24.2 and the current long-term release 7.23.5 both remain affected.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- forum.mikrotik.com/t/7-25beta-development-is-released/272788 (release-notes, patch)
- www.vulncheck.com/advisories/mikrotik-routeros-improper-input-validation-dos-vi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-93345?
- CVE-2026-93345 is a high-severity vulnerability in Mikrotik Routeros, classified under Improper Validation of Specified Quantity in Input. CVSS score: 7.5/10. Published 2026-09-22.
- How severe is CVE-2026-93345?
- High severity. CVSS v3 base score is 7.5 out of 10.