---
cve: "CVE-2026-73446"
severity: "HIGH"
cvss: 7.0
epss: "25%"
vendor: "Arista Networks"
kev: false
exploited: false
published: "2026-09-16 00:17:05"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T10:28:10+02:00"
---

# CVE-2026-73446

> 7.0 HIGH

## Beschreibung

On affected platforms running Arista EOS with IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to tear down an established IS-IS adjacency. This may result in traffic disruption and loss of IP reachability for prefixes advertised through that adjacency.

## CVSS-Vektor

```
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
```

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

## Referenzen

- <https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73446) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_