---
cve: "CVE-2026-73458"
severity: "CRITICAL"
cvss: 9.2
epss: "38%"
vendor: "Arista Networks"
kev: false
exploited: false
published: "2026-09-15 20:17:43"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T01:57:10+02:00"
---

# CVE-2026-73458

> 9.2 CRITICAL

## Beschreibung

On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s).

## CVSS-Vektor

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

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

## Referenzen

- <https://www.arista.com/en/support/advisories-notices/security-advisory/24710-security-advisory-0154>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73458) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_