TI-2026-51567 Aliases CVE-2026-73451 GHSA-66c7-m7g9-9qrj

On affected platforms running Arista EOS with dual switch cards and with ingress Security…

LOW 27CWE-1419Published 2026-09-15 · Updated 2026-09-15

Key facts

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

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

Summary

On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can cause security ACLs on shared SVIs to stop functioning. This may result in incorrect packet permit/deny behavior. This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00229 13th 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 – 4.36.0.1F; 4.35.0 – 4.35.4M; 4.34.0 – 4.34.6M; 4.33.0 – 4.33.8M; 4.32.0 – 4.32.11M; 4.31.1F – 4.31.10M	—	No fix listed	CNA

EOS VendorArista Affected 4.36.0 – 4.36.0.1F; 4.35.0 – 4.35.4M; 4.34.0 – 4.34.6M; 4.33.0 – 4.33.8M; 4.32.0 – 4.32.11M; 4.31.1F – 4.31.10M Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-73451
2026-10-03 Alias added: GHSA-66c7-m7g9-9qrj

References

Other 1

https://www.arista.com/en/support/advisories-notices/security-advisory/24707-security-advisory-0151

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