TI-2021-09613 Aliases CVE-2021-28506 GHSA-6vpx-f5jx-6w5m

Improper authorization in Arista EOS

MEDIUM 42CWE-285Published 2022-01-14 · Updated 2024-09-16

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: No fix listed

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 certain gNOI APIs incorrectly skip authorization and authentication which could potentially allow a factory reset of the device.

Why it matters now

EPSS 0.01465 73rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

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	EOS	4.26.2F – 4.26.0; 4.25.5.1M – 4.25.5; 4.25.4M – 4.25.4; 4.25.3 – 4.25.0; 4.24.7M – 4.24.2F	—	No fix listed	CNA

EOS VendorArista Affected 4.26.2F – 4.26.0; 4.25.5.1M – 4.25.5; 4.25.4M – 4.25.4; 4.25.3 – 4.25.0; 4.24.7M – 4.24.2F Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:arista:eos::::::::	4.24.0 – 4.24.7m; 4.25.0 – 4.25.3; 4.25.4 – 4.25.4m; 4.25.5 – 4.25.5.1m; 4.26.0 – 4.26.2f	Vulnerable	Arista

cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* Versions 4.24.0 – 4.24.7m; 4.25.0 – 4.25.3; 4.25.4 – 4.25.4m; 4.25.5 – 4.25.5.1m; 4.26.0 – 4.26.2f Vulnerable ·Arista

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-28506
2026-10-03 Alias added: GHSA-6vpx-f5jx-6w5m

References

Exploit 1

https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071

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

See all 45 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences