Arista Extensible Operating System Validation Bypass Added to CISA's Known Exploited Vulnerabilities List; Federal Remediation Window for Covered Entities Closed June 23rd

Last refreshed2026-09-27

Status: KEV | Advisory ID: CVE-2026-7473

Key Details

CVE	CVE-2026-7473
Vulnerability Name	Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
Affected products	Arista Extensible Operating System
Exploitation status	Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified as	CWE-1023 (Incomplete Comparison with Missing Factors)
KEV listing	Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-06-09.
Exploitation prediction (EPSS)	0.65% probability of exploitation in the next 30 days (49% percentile) -- FIRST.org's EPSS model.
Federal remediation deadline	2026-06-23 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

Vendor	Product	Affected Versions	Patch Status
Arista	Extensible Operating System

Vendor

Product

Affected Versions

Patch Status

Arista

Extensible Operating System

Subsystems	General OT
Sectors	Multiple

What to Know

Arista Extensible Operating System (EOS) contains an incomplete comparison with missing factors vulnerability when the switch incorrectly decapsulate and forwards other unexpected tunneled packet with a destination IP matching its configured decapsulation IP.

What to Do

Monitor Arista's web page for any future patch releases.

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-7473
CVE	https://www.cve.org/CVERecord?id=CVE-2026-7473

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-7473

CVE

https://www.cve.org/CVERecord?id=CVE-2026-7473

KEV Required Action

Field	Value
KEV Link	https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV	2026-06-09
Required Action Due Date	2026-06-23
Required Action	Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Field

Value

KEV Link

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Date Added to KEV

2026-06-09

Required Action Due Date

2026-06-23

Required Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.