CVE-2020-15898

Name: CVE-2020-15898
Creator: NVD / NIST
Published: 2020-12-28T19:15:12.783+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.97%

Last modified Jun 17, 2026

CVE-2020-15898 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. In Arista EOS malformed packets can be incorrectly forwarded across VLAN boundaries in one direction. This vulnerability is only susceptible to exploitation by unidirectional traffic (ex. EPSS estimates a 0.97% chance of exploitation in the next 30 days.

Description

In Arista EOS malformed packets can be incorrectly forwarded across VLAN boundaries in one direction. This vulnerability is only susceptible to exploitation by unidirectional traffic (ex. UDP) and not bidirectional traffic (ex. TCP). This affects: EOS 7170 platforms version 4.21.4.1F and below releases in the 4.21.x train; EOS X-Series versions 4.21.11M and below releases in the 4.21.x train; 4.22.6M and below releases in the 4.22.x train; 4.23.4M and below releases in the 4.23.x train; 4.24.2.1F and below releases in the 4.24.x train.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.97%

57.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Arista	Eos	>= 4.21.0f, <= 4.21.4.1f
Arista	Eos	>= 4.21.0f, <= 4.21.11m
Arista	Eos	>= 4.22.0f, <= 4.22.6m
Arista	Eos	>= 4.23.0f, <= 4.23.4m
Arista	Eos	>= 4.24.0f, <= 4.24.2.1f

References

https://www.arista.com/en/support/advisories-notices/security-advisories/11996-security-advisory-56Exploit, Vendor Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/11996-security-advisory-56Exploit, Vendor Advisory

Timeline

Published: Dec 28, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15898?

How severe is CVE-2020-15898?

CVE-2020-15898 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.97% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15898?

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-2020-15898?

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

Scan your code now

Source: NVD / NIST