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TI-2026-51556 Aliases CVE-2026-73438GHSA-665h-qpgj-xrwp

Reachable assertion in Arista EOS

Priority LOW 30CWE-617Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-617.

Summary

On affected platforms running Arista EOS with Open Shortest Path First version 3 (OSPFv3) configured, an unauthenticated attacker on the same OSPFv3 broadcast domain can send a specially crafted set of packets that can cause the Ospf3 agent to restart unexpectedly. The crash results in the loss of all OSPFv3 adjacencies on the affected device and may disrupt routing across the broader OSPF domain until the agent recovers. This issue was reported externally by Dravanet Inc., and Arista 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 0.00246 15th 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

VendorProductAffected versionsFixed inStatusSource
AristaEOS4.36.0F – 4.36.1F; 4.35.0F – 4.35.5M; 4.34.0F – 4.34.7M; 4.33.0F – 4.33.9M; 1.0.0 to before 4.33.0F—No fix listedCNA
  • EOS VendorArista Affected 4.36.0F – 4.36.1F; 4.35.0F – 4.35.5M; 4.34.0F – 4.34.7M; 4.33.0F – 4.33.9M; 1.0.0 to before 4.33.0F 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.

  • Release ·

    Arista Networks EOS 4.33.0F

    5 records Highest priority Priority MEDIUM 1 MEDIUM, 4 LOW

    Other records, highest priority first

    • TI-2026-51570 On affected platforms running Arista EOS with Open Shortest Path First version 3 (OSPFv3)…Priority MEDIUM 45
    • TI-2026-51583 A specially crafted packet can cause the premature expiry of multicast forwarding state…Priority LOW 31
    • TI-2026-51558 On affected platforms running Arista EOS with Simple Network Management Protocol (SNMP)…Priority LOW 12
    Show all 5 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-73438
  2. 2026-10-03 Alias added: GHSA-665h-qpgj-xrwp

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