Improper authentication in Arista EOS
Priority LOW 36CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.
Summary
On affected platforms running Arista EOS with 802.1x authentication configured on the access/trunk ports, and routing enabled on the access VLAN of the ports, a malicious supplicant may be able to bypass the requirement to perform 802.1x authentication.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00317 24th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Arista | EOS | 4.31.0 – 4.31.0F; 4.30.0 – 4.30.4M; 4.29.0 – 4.29.6M; 4.28.0 – 4.28.8M; 4.27.0 – 4.27.11M; 4.26.0 – 4.26.11M; 4.25.0 – 4.25.11M; 4.24.0 – 4.24.11M | — | No fix listed | CNA |
- EOS VendorArista Affected 4.31.0 – 4.31.0F; 4.30.0 – 4.30.4M; 4.29.0 – 4.29.6M; 4.28.0 – 4.28.8M; 4.27.0 – 4.27.11M; 4.26.0 – 4.26.11M; 4.25.0 – 4.25.11M; 4.24.0 – 4.24.11M Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-5502
- 2026-10-03 Alias added: GHSA-q5p5-569h-ccvx
References
More Arista vulnerabilities
- TI-2026-79524 Privilege escalation in Arista VeloCloud Orchestrator on-premises KEVCVSS 4.0CRITICAL 9.4
- TI-2026-63212 Improper input validation in Arista VeloCloud Orchestrator On-Prem KEVCVSS 4.0CRITICAL 9.5
- TI-2026-13992 VeloCloud Orchestrator OS Command Injection KEVCVSS 4.0CRITICAL 10.0
- TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
- TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
- TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
Sources
- CVE-2023-5502 · CVE Program
- CVE-2023-5502 · NVD
- FIRST EPSS
- GHSA-q5p5-569h-ccvx · GitHub Advisory Database · CC BY 4.0
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