CVE-2026-73440: Security Advisory 0178
On affected platforms running Arista EOS with Simple Network Management Protocol (SNMP) configured, SNMPv3 local or remote user credentials may be exposed as a one-way hashed, localized key value within the device's running and sanitized configurations. An authenticated user who gains access to this sensitive information could leverage it to perform unauthorized read operations on SNMP tables or to send fraudulent trap notifications to the Network Management System (NMS).
This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Arista EOS (SNMPv3)to a version that resolves this vulnerability.Fixed in 4.33.10M - Upgrade
Upgrade
Arista EOS (SNMPv3)to a version that resolves this vulnerability.Fixed in 4.34.8M - Upgrade
Upgrade
Arista EOS (SNMPv3)to a version that resolves this vulnerability.Fixed in 4.35.6M - Upgrade
Upgrade
Arista EOS (SNMPv3)to a version that resolves this vulnerability.Fixed in 4.36.2F - Configuration
After upgrading to a remediated Arista EOS version, execute the syntax conversion command: "configure convert new-syntax" to adopt the updated encrypted SNMPv3 CLI format.
Arista EOS SNMPv3 CLI configure convert new-syntax = Execute after upgrade
Event History
Frequently Asked Questions
Which environments are exposed to this issue?
Affected platforms running Arista EOS are exposed when SNMP is configured. The issue concerns SNMPv3 local or remote user credentials appearing in running and sanitized configurations as one-way hashed, localized key values.
What access would an attacker need to abuse the exposed credential material?
An attacker must be authenticated and able to access the sensitive configuration information. They could then use the exposed values for unauthorized SNMP table reads or to send fraudulent trap notifications to the NMS.
Is there evidence of exploitation in customer networks?
No. Arista reports that it is not aware of malicious exploitation of this vulnerability in customer networks.