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TI-2026-51563 Aliases CVE-2026-73446GHSA-gq4c-29w8-926p

On affected platforms running Arista EOS with IS-IS configured on a broadcast interface…

Priority LOW 30CWE-696Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

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

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00265 18th percentileScored 2026-11-07
Fix Fixed EOS (Arista Networks): 4.33.0F, 4.32.0F

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

VendorProductAffected versionsFixed inStatusSource
AristaEOS4.36.0 – 4.36.1F; 4.35.0 – 4.35.5M; 4.34.0 – 4.34.7.1M; 4.33.0 – 4.33.9M; 4.32.0 to before 4.33.0F; 4.31.0 to before 4.32.0F4.33.0F, 4.32.0FPatch availableCNA
  • EOS VendorArista Affected 4.36.0 – 4.36.1F; 4.35.0 – 4.35.5M; 4.34.0 – 4.34.7.1M; 4.33.0 – 4.33.9M; 4.32.0 to before 4.33.0F; 4.31.0 to before 4.32.0F Fixed in 4.33.0F, 4.32.0F Patch available CNA

Remediation

  • Fix · CNA EOS (Arista Networks) Fixed in 4.33.0F, 4.32.0F

Fixed in the same release

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

  • Advisory ·

    Arista Networks EOS — Security Advisory 0160

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-51575 Incorrect authorization in Arista EOSPriority LOW 30
    • TI-2026-51574 On affected platforms running Arista EOS with IS-IS configured, an unauthenticated…Priority LOW 30
    Show all 3 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-73446
  2. 2026-10-03 Alias added: GHSA-gq4c-29w8-926p

References

Advisory 1

  • 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