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CVE-2026-73438

Security Advisory 0172

MEDIUM
5.3
CVSS Score
Published: September 16, 2026 at 09:38 AM UTC
Updated: September 16, 2026 at 07:24 PM UTC
1 product affected across 1 vendorArista EOS

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Arista EOS· Arista Networks
60%
1.0.0 ≤ v < 4.33.0F4.33.0F ≤ v ≤ 4.33.9M4.34.0F ≤ v ≤ 4.34.7M4.35.0F ≤ v ≤ 4.35.5M4.36.0F ≤ v ≤ 4.36.1F1.0.04.33.0F4.34.0F4.35.0F4.36.0F
Affected range stops below 4.33.0F, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://www.arista.com/en/support/advisories-notices/security-advisory/24728-security-advisory-0172

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMArista
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-617

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