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CVE-2026-120974 arista networks eos: Authentication Bypass by Capture-replay

6.9 mediumEPSS 0.3%

Medium (6.9) in arista networks eos. EPSS 0.3% estimated probability of exploitation activity in the next 30 days.

On this page
On affected platforms running Arista EOS with IPsec AutoVPN Feature configured with dynamic paths, the configured IPsec replay window may not be applied as expected. As a result, IPsec anti-replay protection may be silently inactive even when it has been configured via an SA policy, contrary to the operator's expectation. This issue does not allow decryption of the affected IPsec traffic, but it may allow replay of previously valid protected traffic.

Severity

CVSS 4.0

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

CVSS 3.1

5.3 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS
0.3% estimated probability of exploitation activity in the next 30 days; 20th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CWE
CWE-294 Authentication Bypass by Capture-replay
OWASP Top 10
A07:2025 Authentication 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 4.27.0F before 4.28.0F
Arista Networks EOSfrom 4.28.0F through 4.28.13M
Arista Networks EOSfrom 4.29.0F before 4.30.0F
Arista Networks EOSfrom 4.30.0F before 4.31.0F
Arista Networks EOSfrom 4.31.0F before 4.32.0F
Arista Networks EOSfrom 4.32.0F before 4.33.0F
Arista Networks EOSfrom 4.33.0F through 4.33.8M
Arista Networks EOSfrom 4.34.0F through 4.34.7M
Arista Networks EOSfrom 4.35.0F through 4.35.5M
Arista Networks EOSfrom 4.36.0F through 4.36.1F

Attack patterns (CAPEC)

  • CAPEC-60 Reusing Session IDs (aka Session Replay) Likelihood: High · Severity: High
  • CAPEC-94 Adversary in the Middle (AiTM) Likelihood: High · Severity: Very High
  • CAPEC-102 Session Sidejacking Likelihood: High · Severity: High
  • CAPEC-509 Kerberoasting Severity: High
  • CAPEC-555 Remote Services with Stolen Credentials Severity: Very High
  • CAPEC-561 Windows Admin Shares with Stolen Credentials
  • CAPEC-644 Use of Captured Hashes (Pass The Hash) Likelihood: Medium · Severity: High
  • CAPEC-645 Use of Captured Tickets (Pass The Ticket) Likelihood: Low · Severity: High
  • CAPEC-652 Use of Known Kerberos Credentials Likelihood: Medium · Severity: High
  • CAPEC-701 Browser in the Middle (BiTM) Likelihood: Medium · Severity: High

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

References

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