Improper authorization in Arista EOS
Priority MEDIUM 41CWE-285Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-285.
Summary
An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with nopassword configuration.
Why it matters now
EPSS 0.00838 58th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Arista EOS (Arista Networks): 0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Arista | Arista EOS | 4.26.1F – 4.26.0; 4.25.4.M – 4.25.0; 4.24.6M – 4.24.6.0; 4.23.8M – 4.23.0; 4.22.11M – 4.22.0; 4.21.14M – 4.21.0; 4.20 to before 0 | 0 | Patch available | CNA |
- Arista EOS VendorArista Affected 4.26.1F – 4.26.0; 4.25.4.M – 4.25.0; 4.24.6M – 4.24.6.0; 4.23.8M – 4.23.0; 4.22.11M – 4.22.0; 4.21.14M – 4.21.0; 4.20 to before 0 Fixed in 0 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* | before 4.20; 4.21.0 – 4.21.14m; 4.22.0 – 4.22.11m; 4.23.0 – 4.23.8m; 4.24.6.0 – 4.24.6m; 4.25.0 – 4.25.4m; 4.26.0 – 4.26.1f | Vulnerable | Arista |
- cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* Versions before 4.20; 4.21.0 – 4.21.14m; 4.22.0 – 4.22.11m; 4.23.0 – 4.23.8m; 4.24.6.0 – 4.24.6m; 4.25.0 – 4.25.4m; 4.26.0 – 4.26.1f Vulnerable ·Arista
Remediation
- Fix · CNA Arista EOS (Arista Networks) Fixed in 0
Timeline
- 2026-10-02 Threatist record created from CVE-2021-28500
- 2026-10-03 Alias added: GHSA-5g2c-wqm3-5vm3
References
More Arista Eos vulnerabilities
- 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-2026-06569 Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass KEVCVSS 4.0MEDIUM 6.9
- TI-2017-10594 Heap-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a… CVSS 3.1CRITICAL 9.8
- TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
- TI-2020-08209 utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-28500 · CVE Program
- CVE-2021-28500 · NVD
- FIRST EPSS
- GHSA-5g2c-wqm3-5vm3 · GitHub Advisory Database · CC BY 4.0
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