Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-7473

EOS

Arista / EOS · 4.36.0

Watch CVE-2026-7473 Browse KEV feed
Severity
CVSS 6.9 · Medium
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
0.6%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-7473 is an unauthenticated vulnerability affecting Arista EOS. On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible LAN), decap-groups, or a...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

Arista / EOS 4.36.0.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

EOS

On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface—is present, the switch will incorrectly decapsulate and forward other unexpected tunneled packet with a destination IP matching its configured decapsulation IP. This occurs because the switch does not verify the tunnel protocol type, potentially leading to the unexpected processing of non-configured tunnel traffic.

This issue has been reported as being exploited in the wild.

Arista Networks Affected
EOS
4.36.0 Through 4.35 Through 4.34 Through 4.33 Through 4.32 Through 4.31 Through 4.30
View vendor advisory (opens in new tab)
Published
05 Jun 2026
Exploitation Reported
05 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-7473
  • Vendor Advisory — arista.com arista.com · Vendor Advisory https://www.arista.com/en/support/advisories-notices/security-advisor...

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 05 Jun 2026

A trusted third party reported exploitation.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CVE First 2026-06-05 16:40 UTC
CISA 2026-06-09 18:01 UTC
All CISA Advisories 2026-06-09 20:20 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

6.9 Medium

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

0.6%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Incomplete Comparison with Missing Factors CWE-1023

Recent mention · All CISA Advisories

CISA Adds Three Known Exploited Vulnerabilities to Catalog

CISA has added three new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-7473 Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability CVE-2026-11645 Google Chromium V8...

Read full advisory

All CVSS Scores

CVSS v4.0 6.9 Medium

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

CVSS v3.1 5.8 Medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Timeline

From disclosure to observed exploitation

  1. 20:20 UTC

    KEV confirmed by All CISA Advisories

    Exploitation attested by an external source

  2. 18:01 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  3. 16:40 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  4. 16:22 UTC

    CVE published

    Vulnerability disclosed publicly

  5. 20:08 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-7473

Sample API response 
{
  "cve_id": "CVE-2026-7473",
  "confidence": "Confirmed",
  "cvss_score": 6.9,
  "cvss_estimated": false,
  "epss_score": 0.00649,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}