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VulnerabilityPublished

CVE-2026-73457: Arista Networks EOS · Sensitive Data in Logs

Affects Arista Networks EOSSource CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium · fixed in 4.36.2F : update Arista Networks EOS when convenient.

Data as of 31 Oct 2026, 20:20 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 24% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.36.2F, 4.35.6M, 4.34.8M
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

What to do

Upgrade Arista Networks EOS to 4.36.2F, 4.35.6M or 4.34.8M.

Affected software

ProductAffectedFixed in
Arista NetworksEOSAffected
  • >=4.36.0 <4.36.2F
Fixed in
  • 4.36.2F
Arista NetworksEOSAffected
  • >=4.35.0 <4.35.6M
Fixed in
  • 4.35.6M
Arista NetworksEOSAffected
  • >=4.34.2F <4.34.8M
Fixed in
  • 4.34.8M

AI-suggested

If you cannot patch yet, restrict access to logs containing sensitive information and consider disabling gNPSI if feasible to reduce exposure.

Description

CVE-2026-73457 is a vulnerability in Arista Networks EOS where gNPSI client credentials may be logged in clear text in local or remote accounting logs on affected versions. This exposure occurs when the gRPC Network Packet Sampling Interface (gNPSI) is enabled, potentially allowing authenticated users to access sensitive credential information. The vulnerability affects specific versions of EOS and has a medium severity rating with a CVSS score of 5.3.

References

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