Vulnerability · Published Sep 16, 2026 · Assigned by Arista

CVE-2026-73440Security Advisory 0178

Medium 4.2

In plain English

A medium-severity security flaw in EOS from Arista Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).

Severity (CVSS 3.1)4.2Medium

Exploit odds (30 days)0.3%top 81.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 products (as reported)

Vendor	Product	Versions
Arista Networks	EOS	4.36.0F – through 4.36.1F4.35.0F – through 4.35.5M4.34.0F – through 4.34.7.1M4.33.0F – through 4.33.9M1.0.0 – before 4.33.0F

Weakness: CWE-212 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

References

Security Advisory 0178 vendor-advisory