TI-2026-51561 Aliases CVE-2026-73444 GHSA-c355-4cc9-9547

On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH)…

LOW 24CWE-303Published 2026-09-15 · Updated 2026-09-16

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · None · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the layer 2 network segment on which VRRP is running could bypass VRRP authentication and claim the virtual router master role, enabling the attacker to intercept, modify, or discard traffic that hosts on the segment send to the virtual gateway address.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00299 22nd percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Arista	EOS	4.36.0 – 4.36.1F; 4.35.0 – 4.35.5M; 4.34.0 – 4.34.7M; 4.33.0 – 4.33.9M; all versions	—	No fix listed	CNA

EOS VendorArista Affected 4.36.0 – 4.36.1F; 4.35.0 – 4.35.5M; 4.34.0 – 4.34.7M; 4.33.0 – 4.33.9M; all versions Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2026-09-15
Arista Networks EOS — arista.com/en/support/advisories-notices/security-advisory/…
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2026-51560 Authentication bypass by capture-replay in Arista EOSPriority LOW 24
- TI-2026-51559 Sensitive information in log files in Arista EOSPriority LOW 11
Show all 3 records → Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-73444
2026-10-03 Alias added: GHSA-c355-4cc9-9547

References

Advisory 1

https://www.arista.com/en/support/advisories-notices/security-advisory/24713-security-advisory-0157

TI-2026-79524 Privilege escalation in Arista VeloCloud Orchestrator on-premises KEVCVSS 4.0CRITICAL 9.4
TI-2026-63212 Improper input validation in Arista VeloCloud Orchestrator On-Prem KEVCVSS 4.0CRITICAL 9.5
TI-2026-13992 VeloCloud Orchestrator OS Command Injection KEVCVSS 4.0CRITICAL 10.0
TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8

See all 216 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences