CVE-2026-73466

Password disclosure via PyServer authentication trace logging

Published Sep 15, 2026 · Updated Sep 15, 2026

Sensitive information exposure in Arista EOS affected releases allows local users to read plaintext user passwords from agent logs. When PyServer trace level 4 is enabled for the Aaa agent, authentication RPC input and response data containing passwords are written to /var/log/agents/Aaa-*. Reachability requires authenticated local administrative shell access and explicit non-standard tracing; the disclosed effect is password confidentiality loss.

CVSS severity6.0
Medium
EPSS probability0.09%
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 affected releases allows local users to read plaintext user passwords from agent logs. When PyServer trace level 4 is enabled for the Aaa agent, authentication RPC input and response data containing passwords are written to /var/log/agents/Aaa-*. Reachability requires authenticated local administrative shell access and explicit non-standard tracing; the disclosed effect is password confidentiality loss.

The record

CVE
CVE-2026-73466
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Arista Networks
Product
Arista EOS
Classifications
CWE-532, T1552.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0.0.0 <=4.33.9M
  2. Affected versionversion=0 <=4.31.0
  3. Affected versionversion=0 <=4.32.0
  4. Affected versionversion=4.34.0 <=4.34.7M
  5. Affected versionversion=4.35.0 <=4.35.4M
  6. Affected versionversion=4.36.0 <=4.36.1F

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Arista Networks · Arista EOSversion=0.0.0 <=4.33.9M; version=0 <=4.31.0; version=0 <=4.32.0; version=4.34.0 <=4.34.7M; version=4.35.0 <=4.35.4M; version=4.36.0 <=4.36.1F

Published CVSS scores

6.0Arista NetworksCVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:P/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H
6.3Arista NetworksCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H

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.

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No observations available

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

Weakness, pattern, technique

CWE-532Insertion of Sensitive Information into Log File
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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