CVE-2026-73444

On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the layer 2 network segment on which VRRP is running could bypass VRRP authentication and claim the

MEDIUM
4.7
CVSS Score
Published: September 15, 2026 at 09:11 PM UTC
Updated: September 16, 2026 at 07:24 PM UTC
1 product affected across 1 vendorArista EOS

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Severity
MEDIUM4.7
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the layer 2 network segment on which VRRP is running could bypass VRRP authentication and claim the virtual router master role, enabling the attacker to intercept, modify, or discard traffic that hosts on the segment send to the virtual gateway address.

Affected

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

4.33.0 ≤ v ≤ 4.33.9M4.34.0 ≤ v ≤ 4.34.7M4.35.0 ≤ v ≤ 4.35.5M4.36.0 ≤ v ≤ 4.36.1F4.33.04.34.04.35.04.36.0

Remediation

No guide yet

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

4.7MEDIUMArista
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-303

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