What is the CVSS score of EUVD-2026-80064?

EUVD-2026-80064 has a CVSS 4.0 base score of 7.0 (High). CVSS vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H. EPSS exploitation probability: 0.2%.

Is there a patch available for EUVD-2026-80064?

Yes, a patch is available for EUVD-2026-80064. Update the affected software to the latest version immediately.

EUVD-2026-80064

| CVE-2026-73446 HIGH

Incorrect Behavior Order (CWE-696)

2026-09-16 psirt@arista.com

GHSA-gq4c-29w8-926p

Information Disclosure

7.0

CVSS 4.0 · Vendor: arista

View

Vulnerability Assessment

Weakness

CWE

CWE-696

ASVS 5.0

V15 - Secure Coding and Architecture Incorrect behavior order

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 16, 2026

Unauthenticated attackers positioned on the same Layer 2 broadcast segment as an Arista EOS device can force that device to tear down an established IS-IS adjacency by sending a crafted IS-IS Hello P

Affected VersionsENISA

EOS 4.33.0 ≤4.33.9M

EOS 4.35.0 ≤4.35.5M

EOS 4.34.0 ≤4.34.7.1M

EOS 4.32.0 <4.33.0F

EOS 4.31.0 <4.32.0F

EOS 4.36.0 ≤4.36.1F

Affected Packages

euvd eos fix: 4.32.0F, 4.33.0F

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (arista) PRIMARY 7.0 HIGH

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

Primary rating from Vendor (arista) · only source for this CVE.

CVSS VectorVendor: arista

Attack Vector

Adjacent

Attack Complexity

Low

Attack Requirements

Present

Privileges Required

None

User Interaction

None

Vulnerable system: Confidentiality

None

Vulnerable system: Integrity

None

Vulnerable system: Availability

High

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

High

Lifecycle Timeline

Patch available

Sep 16, 2026 - 01:02 EUVD

CVE Published

Sep 16, 2026 - 00:17 cve.org

HIGH 7.0

DescriptionCVE.org

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.

Threat Intelligence Overview

EPSS Score

0.2%

Top 84% exploitable

Data Quality

4 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Controlled

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +35

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.