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CVE-2021-28503

CRITICALCVSS 9.8/10EPSS 0.72%

Last modified

CVE-2021-28503 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The impact of this vulnerability is that Arista's EOS eAPI may skip re-evaluating user credentials when certificate based authentication is used, which allows remote attackers to access the device via eAPI.. EPSS estimates a 0.72% chance of exploitation in the next 30 days.

Description

The impact of this vulnerability is that Arista's EOS eAPI may skip re-evaluating user credentials when certificate based authentication is used, which allows remote attackers to access the device via eAPI.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.72%

49.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
AristaEos>= 4.22, <= 4.22.9m
AristaEos>= 4.23, <= 4.23.9
AristaEos>= 4.24, <= 4.24.7
AristaEos>= 4.25, <= 4.25.5
AristaEos>= 4.26, <= 4.26.2

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-28503?
The impact of this vulnerability is that Arista's EOS eAPI may skip re-evaluating user credentials when certificate based authentication is used, which allows remote attackers to access the device via eAPI.
How severe is CVE-2021-28503?
CVE-2021-28503 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.72% probability of exploitation in the next 30 days.
How do I fix CVE-2021-28503?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28503?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST