6.9

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

KEV
Analyzed
Published 05-06-2026Last modified 07-10-2026

Vulnerability summary

CVE-2026-7473 is a medium (CVSS 6.9) vulnerability in Arista Extensible Operating System. It is known to be exploited: CISA lists it, first on 09-06-2026. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 50.4% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.65%
0%100%
Low · -0.46 pp in 30 days
KEVExploited in the wildCritical · listed in 1 catalog
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 05-06-2026
    PublishedVulnerability first disclosed.
  2. 09-06-2026
    Added to CISA KEVExploitedArista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
  3. 23-06-2026
    CISA remediation dueDeadline passedApply mitigations per vendor instructions.
  4. 07-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.65%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

Decrease -0.46 pp

From 1.11% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
09-06-2026
Federal due date
23-06-2026
ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

CISA 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. www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137 nvd.nist.gov/vuln/detail/CVE-2026-7473

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Arista networks1 product
  • eos4.36.0 | ≥ 4.35.0, ≤ 4.35 | ≥ 4.34.0, ≤ 4.34 | ≥ 4.33.0, ≤ 4.33 | ≥ 4.32.0, ≤ 4.32 | ≥ 4.31.0, ≤ 4.31 | ≤ 4.30

1 vendor · 1 product

References

3 links