9.1
CRITICAL
CVE-2021-28506
Arista EOS Authentication Bypass
Description

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.

INFO

Published Date :

Jan. 14, 2022, 8:15 p.m.

Last Modified :

July 14, 2022, 6:47 p.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.2

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-28506 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
: Total Affected Vendor : 1 | Products : 1
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-2021-28506.

URL Resource
https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071 Exploit 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-2021-28506 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-28506 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]

    Jul. 14, 2022

    Action Type Old Value New Value
    Removed CWE NIST CWE-863
    Added CWE NIST CWE-862
    Added CWE NIST CWE-306
  • Initial Analysis by [email protected]

    Jan. 26, 2022

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:C/A:C)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
    Changed Reference Type https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071 No Types Assigned https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071 Exploit, Mitigation, Patch, Vendor Advisory
    Added CWE NIST CWE-863
    Added CPE Configuration OR *cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* versions from (including) 4.24.0 up to (including) 4.24.7m *cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* versions from (including) 4.25.0 up to (including) 4.25.3 *cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* versions from (including) 4.25.4 up to (including) 4.25.4m *cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* versions from (including) 4.25.5 up to (including) 4.25.5.1m *cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* versions from (including) 4.26.0 up to (including) 4.26.2f
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.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-28506 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-28506 weaknesses.

CAPEC-1: Accessing Functionality Not Properly Constrained by ACLs Accessing Functionality Not Properly Constrained by ACLs CAPEC-5: Blue Boxing Blue Boxing CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-17: Using Malicious Files Using Malicious Files CAPEC-39: Manipulating Opaque Client-based Data Tokens Manipulating Opaque Client-based Data Tokens CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-51: Poison Web Service Registry Poison Web Service Registry CAPEC-59: Session Credential Falsification through Prediction Session Credential Falsification through Prediction CAPEC-60: Reusing Session IDs (aka Session Replay) Reusing Session IDs (aka Session Replay) CAPEC-76: Manipulating Web Input to File System Calls Manipulating Web Input to File System Calls CAPEC-77: Manipulating User-Controlled Variables Manipulating User-Controlled Variables CAPEC-87: Forceful Browsing Forceful Browsing CAPEC-104: Cross Zone Scripting Cross Zone Scripting CAPEC-127: Directory Indexing Directory Indexing CAPEC-402: Bypassing ATA Password Security Bypassing ATA Password Security CAPEC-647: Collect Data from Registries Collect Data from Registries CAPEC-668: Key Negotiation of Bluetooth Attack (KNOB) Key Negotiation of Bluetooth Attack (KNOB) CAPEC-12: Choosing Message Identifier Choosing Message Identifier CAPEC-36: Using Unpublished Interfaces or Functionality Using Unpublished Interfaces or Functionality CAPEC-62: Cross Site Request Forgery Cross Site Request Forgery CAPEC-166: Force the System to Reset Values Force the System to Reset Values CAPEC-216: Communication Channel Manipulation Communication Channel Manipulation CAPEC-665: Exploitation of Thunderbolt Protection Flaws Exploitation of Thunderbolt Protection Flaws
Exploit Prediction

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

0.09 }} 0.01%

score

0.38386

percentile

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