Vulnerability Details : 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.
Vulnerability category: BypassGain privilege
Products affected by CVE-2021-28503
- cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
- cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
- cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
- cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
- cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-28503
0.28%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 68 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-28503
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:P |
8.6
|
6.4
|
NIST | |
|
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST | |
|
7.4
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H |
2.2
|
5.2
|
Arista Networks, Inc. |
CWE ids for CVE-2021-28503
-
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.Assigned by: nvd@nist.gov (Primary)
-
The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.Assigned by: psirt@arista.com (Secondary)
References for CVE-2021-28503
-
https://www.arista.com/en/support/advisories-notices/security-advisories/13605-security-advisory-0072
Security Advisory 0072 - AristaMitigation;Patch;Vendor Advisory
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