CVE-2024-27890Network attack vector

Authenticated switch reconfiguration via gNMI authorization bypass

Published Jun 4, 2026 · Updated Jun 4, 2026

Authorization bypass in Arista Networks EOS allows remote authenticated users to alter switch configuration through a gNMI Set request. When OpenConfig is enabled, the gNMI service executes a Set request that its authorization path should reject, applying attacker-supplied configuration. Low-privileged authenticated access and network reachability to gNMI are required; unauthorized changes can disrupt switch operation, with no confidentiality impact reported.

CVSS severity7.2
High
EPSS probability4.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Authorization bypass in Arista Networks EOS allows remote authenticated users to alter switch configuration through a gNMI Set request. When OpenConfig is enabled, the gNMI service executes a Set request that its authorization path should reject, applying attacker-supplied configuration. Low-privileged authenticated access and network reachability to gNMI are required; unauthorized changes can disrupt switch operation, with no confidentiality impact reported.

The record

CVE
CVE-2024-27890
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
Arista Networks
Product
Arista Extensible Operating System (EOS)
Classifications
CWE-306, T1565
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.24.0 <=4.24.11M
  2. Affected versionversion=4.25.0 <=4.25.10M
  3. Affected versionversion=4.26.0 <=4.26.9M
  4. Affected versionversion=4.27.0 <=4.27.8M
  5. Affected versionversion=4.28.0 <=4.28.10M
  6. Affected versionversion=4.29.0 <=4.29.7M

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Arista Networks · Arista Extensible Operating System (EOS)version=4.24.0 <=4.24.11M; version=4.25.0 <=4.25.10M; version=4.26.0 <=4.26.9M; version=4.27.0 <=4.27.8M; version=4.28.0 <=4.28.10M; version=4.29.0 <=4.29.7M

Published CVSS scores

9.6Arista NetworksCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
7.2Arista NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

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-306Missing Authentication for Critical Function
T1565Data Manipulation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo