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CVE-2026-73435

Security Advisory 0171

HIGH
8.2
CVSS Score
Published: September 16, 2026 at 09:19 AM UTC
Updated: September 16, 2026 at 07:24 PM UTC
1 product affected across 1 vendorArista EOS

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Severity
HIGH8.2
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

On affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment, with OSPFv2 authentication configured can cause adjacency flapping and packet loss. The disruption can affect routing across the broader OSPF domain.

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/24727-security-advisory-0171

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

8.2HIGHArista
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-345

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