THREAT WATCH
High Microsoft Active Directory Federation Services: CVE-2026-56155 — Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability Medium Microsoft SharePoint Server: CVE-2026-56164 — Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability Actively Exploited SonicWall SMA1000 Appliances: CVE-2026-15409 — SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability Actively Exploited SonicWall SMA1000 Appliances: CVE-2026-15410 — SonicWall SMA1000 Appliances Code Injection Vulnerability Medium Cisco IOS: CVE-2008-4128 — Cisco IOS Cross-Site Request Forgery Vulnerability Critical Balbooa Forms: CVE-2026-56291 — Balbooa Forms Unrestricted Upload of File with Dangerous Type Vulnerability Critical iCagenda iCagenda: CVE-2026-48939 — iCagenda Unrestricted Upload of File with Dangerous Type Vulnerability Critical Joomlack Page Builder: CVE-2026-56290 — Joomlack Page Builder Improper Access Control Vulnerability High Microsoft Active Directory Federation Services: CVE-2026-56155 — Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability Medium Microsoft SharePoint Server: CVE-2026-56164 — Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability Actively Exploited SonicWall SMA1000 Appliances: CVE-2026-15409 — SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability Actively Exploited SonicWall SMA1000 Appliances: CVE-2026-15410 — SonicWall SMA1000 Appliances Code Injection Vulnerability Medium Cisco IOS: CVE-2008-4128 — Cisco IOS Cross-Site Request Forgery Vulnerability Critical Balbooa Forms: CVE-2026-56291 — Balbooa Forms Unrestricted Upload of File with Dangerous Type Vulnerability Critical iCagenda iCagenda: CVE-2026-48939 — iCagenda Unrestricted Upload of File with Dangerous Type Vulnerability Critical Joomlack Page Builder: CVE-2026-56290 — Joomlack Page Builder Improper Access Control Vulnerability

CVE-2026-7473 — Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability

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  • Posted onJune 9, 2026
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Medium CVSS 5.8 Actively exploited · CISA KEV

Arista Extensible Operating System

CVE-2026-7473 Added Jun 9, 2026 Remediation deadline has passed
TL;DR

Arista Extensible Operating System is affected by a medium-severity vulnerability (CVE-2026-7473) that is confirmed to be actively exploited in the wild. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What is this vulnerability?

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.

How it works

This is classified as CWE-1023. In plain terms, an attacker could use this flaw in Extensible Operating System to gain access, disrupt service, or steal data — the exact impact depends on how it’s deployed in your environment.

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

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.

Mitigations

  • Apply the vendor’s security patch or update as soon as it’s available and tested.
  • If no patch exists yet, apply the vendor’s temporary workaround.
  • Limit network exposure of the affected system until it’s patched.
  • Review logs for signs of prior exploitation, especially if it’s flagged for ransomware use.

Recommendations

  • Confirm whether Arista Extensible Operating System is used anywhere in your environment.
  • Patch internet-facing systems first, then internal ones.
  • Set a reminder ahead of the remediation deadline so it doesn’t slip.
  • Subscribe to the vendor’s security advisories for earlier warning next time.

Compiled from public threat intelligence (CISA Known Exploited Vulnerabilities catalog and the National Vulnerability Database, referenced in 3 public advisories).