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VulnerabilityPublished

CVE-2026-120976: Arista Networks EOS · Sensitive Data in Logs

Affects Arista Networks EOSSource CVE Database V5

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Not known to be exploited · CVSS 6.0 Medium : upgrade to 4.33.0F or 4.32.0F when convenient.

Data as of 10 Nov 2026, 20:34 UTC

CVSS 3.1 base score
6.0Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (Arista)CVSS 3.16.0
CNA (Arista)CVSS 4.07.0
Patch
Available – fixed in 4.33.0F, 4.32.0F
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Nov 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 10 Nov 2026.

What to do

Upgrade Arista Networks EOS to 4.33.0F or 4.32.0F.

Affected software

ProductAffectedFixed in
Arista NetworksEOSAffected
  • >=4.22.0F <4.32.0F
  • >=4.32.0F <4.33.0F
  • >=4.33.0F <=4.33.9M
  • >=4.34.0F <=4.34.8M
  • >=4.35.0F <=4.35.6M
  • >=4.36.0F <=4.36.2F
Fixed in
  • 4.33.0F
  • 4.32.0F

AI-suggested

Fixed versions 4.32.0F and 4.33.0F are available and address this vulnerability. Users should upgrade affected EOS versions to at least 4.32.0F or 4.33.0F to remediate the issue. No additional mitigation steps are indicated or required beyond applying the official fix.

Description

CVE-2026-120976 is a vulnerability in Arista Networks EOS affecting platforms running IEEE 802.1X authentication and MACsec with dynamically derived keys. During a Smart Switch Upgrade (SSU) reload with an active 802.1X session, sensitive authentication information may be logged in diagnostic data. An attacker with administrative access to the device and access to this diagnostic data could recover sensitive authentication information, potentially compromising the confidentiality and integrity of MACsec-protected traffic. The vulnerability is present only during and after the SSU reload process when an active session exists.

References

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