CVE-2026-73464 PUBLISHED

Security Advisory 0166

Assigner: Arista
Reserved: 12.08.2026 Published: 16.09.2026 Updated: 17.09.2026

On affected platforms running Arista EOS with gRPC Network Management Interface (gNMI) enabled, a specially crafted request could allow a malicious authenticated client with gRPC Network Management Interface (gNMI) access to execute arbitrary code with root privileges on the switch.

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 8.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	Arista Networks
Product	EOS
Versions	Default: unaffected affected from 4.29.0F to 4.30.0F (excl.) affected from 4.30.0F to 4.31.0F (excl.) affected from 4.31.0F to 4.32.0F (excl.) affected from 4.32.0F to 4.33.0F (excl.) affected from 4.33.0F to 4.33.8M (incl.) affected from 4.34.0F to 4.34.7M (incl.) affected from 4.35.0F to 4.35.5M (incl.) affected from 4.36.0F to 4.36.0.1F (incl.)

Affected Configurations

In order to be vulnerable to CVE-2026-73464, the following condition must be met:

gNMI transport must be enabled:

switch(config)#show management api gnmi Transport: default Enabled: yes Server: running on port 6030, in default VRF SSL profile: none QoS DSCP: none Connection limit: 100 Authorization required: no Accounting requests: no Notification timestamp: last change time Listen addresses: :: Authentication username priority: x509-spiffe, metadata, x509-common-name Config-commands AAA accounting: enabled Config-commands AAA authorization: enabled

If a gNMI transport is not configured there is no exposure to this issue and the message will look something like:

switch(config)#show management api gnmi Enabled: no transports enabled

Workarounds

Disable any gNMI transports:

management api gnmi no transport grpc <name>

Disabling all gNMI transports makes gNMI, gNOI, and gNSI services unavailable. If no RESTCONF or NETCONF transports are configured, the OpenConfig/Octa agent will also stop. CloudVision provisioning via TerminAttr is unaffected. All services resume when a gNMI transport is re-enabled.

Note: This mitigation is not applicable to DMF-managed EOS switches. gNMI transports are enabled by default on these platforms and cannot be disabled.

Solutions

The following EOS releases contain the fix for this vulnerability: - 4.33.9M and later releases in the 4.33.x train - 4.34.7.1M and later releases in the 4.34.x train - 4.35.6M and later releases in the 4.35.x train - 4.36.1F and later releases in the 4.36.x train

No hotfix is available for this vulnerability.

References

Arista Networks Security Advisory 0166

Problem Types

CWE-94 Improper Control of Generation of Code ('Code Injection') CWE

Impacts

CAPEC-242 Code Injection