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

Patch now

MEDIUM 5.8EXPLOITEDREMOTEMITIGATE

CVE-2026-7473 is a medium-severity flaw (CVSS 5.8) affecting eos, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Exploited in the wild (CISA KEV)
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	Yes, fix due 2026-06-23
Weakness	CWE-1023
Published	2026-06-05
Last modified	2026-10-25

Publisher (CNA): Arista Networks, Inc. · Vendor: arista

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-05 17:17 UTCPublished CVE record published
2026-06-09Exploited Added to the CISA Known Exploited Vulnerabilities list
2026-06-23Deadline CISA due date for US federal agencies to patch
2026-10-25 23:10 UTCUpdated Record last modified

arista eos MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · mingw-qt5-qtwebkit · FIXED · 5.212.0-0.46.alpha4.fc46 · FEDORA-2026-46ae541c22 · source

sudo dnf upgrade --advisory=FEDORA-2026-46ae541c22

Fedora ELN · kdominate · FIXED · 26.08.2-2.eln159 · FEDORA-2026-b1d98239fd · source

sudo dnf upgrade --advisory=FEDORA-2026-b1d98239fd

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: fevar54/CVE-2026-7473---Arista-EOS-Tunnel-Decapsulation-Bypass (1 stars)

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-7473?

eos: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-7473 being exploited?

Yes. CVE-2026-7473 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2026-7473 affect?

CVE-2026-7473 affects eos. Severity is medium (CVSS 5.8). 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 deca

How urgent is CVE-2026-7473?

Priority 70/100. Exploited in the wild (CISA KEV); CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

References

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