CVE-2026-73454 PUBLISHED

Security Advisory 0165

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

On affected platforms running Arista EOS with gRPC Network Security Interface (gNSI) Credentialz configured, a specially crafted request can cause unintended modifications to the target account's properties. This may result in the account being assigned elevated privileges or access beyond what an administrator intended.

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS Score: 8.1

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

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 8.6

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	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	Arista Networks
Product	EOS
Versions	Default: unaffected 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-2026-73454, the following condition must be met:

gNSI Credentialz must be enabled (Note: gNSI Credentialz is disabled by default):

switch(config)#show management api gnsi Transport: default Transport enabled: yes Server: running on port 6030, in default VRF

Acctz enabled: no Attestz enabled: no Authz enabled: no Certz enabled: no Credentialz enabled: yes Enrollz enabled: no Pathz enabled: no

If Credentialz is not enabled there is no exposure to this issue.

Workarounds

Disable gNSI Credentialz service. Note: Disabling Credentialz prevents gNSI-based credential rotation (SSH keys, passwords, host parameters) but does not affect traditional EOS CLI credential management. Credentialz is not enabled by default.

switch(config)#management api gnsi switch(config-mgmt-api-gnsi)#no service credentialz

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 0165

Problem Types

CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection') CWE

Impacts

CAPEC-88 OS Command Injection