---
cve: "CVE-2026-93345"
severity: "HIGH"
cvss: 8.7
epss: "0.5%"
vendor: "MikroTik"
kev: false
exploited: false
published: "2026-09-22 18:17:30"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-29T06:26:38+02:00"
---

# CVE-2026-93345

> 8.7 HIGH

## Beschreibung

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.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **partial**

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## BSI-Hinweise (deutsch)

- [MikroTik RouterOS: Schwachstelle ermöglicht Denial of Service](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-3523) — _BSI-Einstufung: mittel_
  Ein entfernter, anonymer Angreifer kann eine Schwachstelle in MikroTik RouterOS ausnutzen, um einen Denial of Service Angriff durchzuführen.

## Referenzen

- <https://forum.mikrotik.com/t/7-25beta-development-is-released/272788>
- <https://www.vulncheck.com/advisories/mikrotik-routeros-improper-input-validation-dos-via-bgp-labelled-vpn-nlri>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-93345) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_