Threat landscape
high

Arista EOS: Mehrere Schwachstellen

WID-SEC-2026-3287 · first 10.09.2026 · updated 17.09.2026 · CVSS 10,0

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What it is about

Arista Extensible Operating System (EOS) ist ein modulares Linux basiertes Netzwerkbetriebssystem. Ein Angreifer kann mehrere Schwachstellen in Arista EOS ausnutzen, um erweiterte Berechtigungen, sogar Administratorrechte, zu erlangen, beliebigen Code, einschließlich Root-Code, auszuführen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren oder offenzulegen sowie Denial-of-Service-Zustände herbeizuführen.

Under what conditions?

The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.

What can happen in the worst case

An attacker could use the vulnerability to

  • erweiterte Berechtigungen
  • sogar Administratorrechte und zu erlangen
  • beliebigen Code
  • einschließlich Root-Code
  • auszuführen
  • Sicherheitsmaßnahmen zu umgehen
  • Daten zu manipulieren oder offenzulegen sowie Denial-of-Service-Zustände herbeizuführen

Am I affected?

Affected according to the BSI:

  • Arista EOS <4.35.6M
  • Arista EOS <4.34.8M
  • Arista EOS <4.36.2F
  • Arista EOS <4.33.10M

The installed version is usually shown under “Help → About” or in the device’s admin interface.

What helps?

Update to at least:

  • Arista EOS 4.35.6M
  • Arista EOS 4.34.8M
  • Arista EOS 4.36.2F
  • Arista EOS 4.33.10M

Is the vulnerability already being exploited?

None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.

Information and sources

CVE: CVE-2026-19655, CVE-2026-73437, CVE-2026-73439, CVE-2026-73440, CVE-2026-73442, CVE-2026-73443, CVE-2026-73444, CVE-2026-73446, CVE-2026-73447, CVE-2026-73450, CVE-2026-73453, CVE-2026-73455, CVE-2026-73456, CVE-2026-73457, CVE-2026-73459, CVE-2026-73460, CVE-2026-73461, CVE-2026-73462, CVE-2026-73468, CVE-2026-73469 …

Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.

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