9.8
CRITICAL
CVE-2021-28503
Arista EOS eAPI Certificate Authentication Bypass
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.

INFO

Published Date :

Feb. 4, 2022, 11:15 p.m.

Last Modified :

Aug. 2, 2022, 3:57 p.m.

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-28503 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Arista eos
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-28503.

URL Resource
https://www.arista.com/en/support/advisories-notices/security-advisories/13605-security-advisory-0072 Mitigation Patch Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-28503 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-28503 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Reanalysis by [email protected]

    Aug. 02, 2022

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Feb. 09, 2022

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://www.arista.com/en/support/advisories-notices/security-advisories/13605-security-advisory-0072 No Types Assigned https://www.arista.com/en/support/advisories-notices/security-advisories/13605-security-advisory-0072 Mitigation, Patch, Vendor Advisory
    Added CWE NIST CWE-287
    Added CPE Configuration OR *cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* versions from (including) 4.22 up to (including) 4.22.9m *cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* versions from (including) 4.23 up to (including) 4.23.9 *cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* versions from (including) 4.24 up to (including) 4.24.7 *cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* versions from (including) 4.25 up to (including) 4.25.5 *cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* versions from (including) 4.26 up to (including) 4.26.2
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.32 }} 0.03%

score

0.71030

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability