CVE-2026-73440Network attack vector

Unauthorized SNMP access via exposed localized keys

Published Sep 16, 2026 · Updated Sep 16, 2026

Sensitive-information exposure in Arista EOS 4.36.1F and earlier allows remote authenticated users to obtain SNMPv3 credential material. Running and sanitized configurations retain one-way hashed localized keys when legacy SNMPv3 user syntax is used. Access requires authenticated configuration visibility and an SNMPv3 authentication key, enabling SNMP table reads or fraudulent NMS traps.

CVSS severity4.2
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive-information exposure in Arista EOS 4.36.1F and earlier allows remote authenticated users to obtain SNMPv3 credential material. Running and sanitized configurations retain one-way hashed localized keys when legacy SNMPv3 user syntax is used. Access requires authenticated configuration visibility and an SNMPv3 authentication key, enabling SNMP table reads or fraudulent NMS traps.

The record

CVE
CVE-2026-73440
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
Arista Networks
Product
Arista EOS
Classifications
CWE-212, T1552.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <4.33.0F
  2. Affected versionversion=4.33.0F <=4.33.9M
  3. Affected versionversion=4.34.0F <=4.34.7.1M
  4. Affected versionversion=4.35.0F <=4.35.5M
  5. Affected versionversion=4.36.0F <=4.36.1F

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Arista Networks · Arista EOSversion=1.0.0 <4.33.0F; version=4.33.0F <=4.33.9M; version=4.34.0F <=4.34.7.1M; version=4.35.0F <=4.35.5M; version=4.36.0F <=4.36.1F

Published CVSS scores

4.2Arista NetworksCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
2.3Arista NetworksCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-212Improper Removal of Sensitive Information Before Storage or Transfer
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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