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CVE-2026-120976 arista networks eos

7.0 highEPSS 0.1%

High (7.0) in arista networks eos. EPSS 0.1% estimated probability of exploitation activity in the next 30 days.

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On affected platforms running Arista EOS with IEEE 802.1X authentication and MACsec using dynamically derived keys, sensitive authentication information may be recorded in diagnostic data during a Smart Switch Upgrade (SSU). An attacker with administrative access on the device who obtains the affected diagnostic data could recover sensitive authentication information. This could potentially compromise the confidentiality and integrity of traffic protected by MACsec on the affected link. The vulnerability is only exposed during and after an SSU reload where an active 802.1X session used for MACsec is present.

Severity

CVSS 4.0

7.0 high
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

6.0 medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
EPSS
0.1% estimated probability of exploitation activity in the next 30 days; 3rd percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CWE
CWE-532 Insertion of Sensitive Information into Log File
OWASP Top 10
A09:2025 Logging & Alerting Failures
Published
Modified
Assigned by
Arista (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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Affected

  • arista networks:eos

Versions

From the CNA's record in the CVE List.

ProductAffected
Arista Networks EOSfrom 4.22.0F before 4.32.0F
Arista Networks EOSfrom 4.32.0F before 4.33.0F
Arista Networks EOSfrom 4.33.0F through 4.33.9M
Arista Networks EOSfrom 4.34.0F through 4.34.8M
Arista Networks EOSfrom 4.35.0F through 4.35.6M
Arista Networks EOSfrom 4.36.0F through 4.36.2F

Attack patterns (CAPEC)

  • CAPEC-215 Fuzzing for application mapping Likelihood: High · Severity: Low

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

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