CVE-2025-5089Network attack vector

Denial of service via malformed peer messages

Published Jun 5, 2026 · Updated Jun 5, 2026

Improper input validation in Arista CVX on affected EOS 4.30.x through 4.34.x allows remote authenticated users to interrupt service. The CVX peer-message path inadequately validates malformed custom TCP messages before Sysdb or CVX agents process them, terminating the agents. Exploitation requires high-privilege access to a connected peer and enabled CVX; impact is limited to a switch soft reset or CVX cluster instability.

CVSS severity6.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Arista CVX on affected EOS 4.30.x through 4.34.x allows remote authenticated users to interrupt service. The CVX peer-message path inadequately validates malformed custom TCP messages before Sysdb or CVX agents process them, terminating the agents. Exploitation requires high-privilege access to a connected peer and enabled CVX; impact is limited to a switch soft reset or CVX cluster instability.

The record

CVE
CVE-2025-5089
Published
Jun 5, 2026
Updated
Jun 5, 2026
Vendor
Arista Networks
Product
CloudVision eXchange (CVX)
Classifications
CWE-20, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.30.0 <4.31.0
  2. Affected versionversion=4.31.0M <=4.31.8M
  3. Affected versionversion=4.32.0M <=4.32.6M
  4. Affected versionversion=4.33.0M <=4.33.4M
  5. Affected versionversion=4.34.0F <=4.34.1F

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Arista Networks · CloudVision eXchange (CVX)version=4.30.0 <4.31.0; version=4.31.0M <=4.31.8M; version=4.32.0M <=4.32.6M; version=4.33.0M <=4.33.4M; version=4.34.0F <=4.34.1F

Published CVSS scores

7.1Arista NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5Arista NetworksCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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