# CVE-2024-27890: Arista EOS unauthorized configuration change via gNMI Set in OpenConfig

Source: https://junglewise.ai/threats/cve-2024-27890-arista-eos-unauthorized-configuration-change-via-gnmi-set-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-04. Updated: 2026-06-04  
License: CC BY 4.0 with a link back

CVE-2024-27890 · Severity: critical · CVSS 9.6 · Published 2026-06-04

A vulnerability in Arista EOS network switches allows unauthorized configuration changes when the OpenConfig management interface is enabled. An attacker with low-level access can bypass certain security checks to apply unintended settings to the device. This could lead to network outages, service disruptions, or unauthorized modifications to network traffic routing.

## Quick answers

**Is CVE-2024-27890 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2024-27890 being exploited in the wild.

**How severe is CVE-2024-27890?** Critical severity, with a CVSS score of 9.6, published 4 June 2026.

**Which products and versions are affected?** Arista Networks EOS All versions with OpenConfig configured.

**Is there a fix for CVE-2024-27890?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2024-27890 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2024-27890?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A vulnerability in Arista EOS, specifically when the OpenConfig management interface is enabled, allows a gNMI Set request to be processed even when it should have been rejected. This is classified as a missing authentication for a critical function (CWE-306). An attacker with network access and low-level privileges (PR:L) can exploit this to modify the device configuration. The impact includes high integrity and availability loss as the switch may be reconfigured in a way that disrupts operations or alters security postures. The vulnerability is reachable over the network via the gNMI service.

## Affected products

- Arista Networks EOS All versions with OpenConfig configured

## Timeline

- 2026-06-04: advisory: Initial advisory publication by Arista Networks

## References

- [https://www.arista.com/en/support/advisories-notices/security-advisory/19862-security-advisory-0099](https://www.arista.com/en/support/advisories-notices/security-advisory/19862-security-advisory-0099)