CVE-2026-93345
MikroTik RouterOS < 7.25beta4 Improper Input Validation DoS via BGP Labelled-VPN NLRI
- State
- Published
- Severity
- 8.7 High
- Published
- Sep 22, 2026
- Updated
- Oct 1, 2026
- Reserved
- Sep 17, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-1284 Improper Validation of Specified Quantity in Input
Affected Products
| Product | Versions |
|---|---|
RouterOSMikroTik |
|
References
- 7.25beta Release Notesrelease-notespatch
- https://www.vulncheck.com/advisories/mikrotik-routeros-improper-input-validation-dos-via-bgp-labelled-vpn-nlrithird-party-advisory
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