CVE-2019-18948

Name: CVE-2019-18948
Creator: NVD / NIST
Published: 2020-04-16T19:15:22.383+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.04%

Last modified Jun 17, 2026

CVE-2019-18948 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was found in Arista EOS. Specific malformed ARP packets can impact the software forwarding of VxLAN packets. EPSS estimates a 1.04% chance of exploitation in the next 30 days.

Description

An issue was found in Arista EOS. Specific malformed ARP packets can impact the software forwarding of VxLAN packets. This issue is found in Arista’s EOS VxLAN code, which can allow attackers to crash the VxlanSwFwd agent. This affects EOS 4.21.8M and below releases in the 4.21.x train, 4.22.3M and below releases in the 4.22.x train, 4.23.1F and below releases in the 4.23.x train, and all releases in 4.15, 4.16, 4.17, 4.18, 4.19, 4.20 code train.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.04%

59.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Arista	Eos	>= 4.21.0, <= 4.21.8m
Arista	Eos	>= 4.22.0, <= 4.22.3m
Arista	Eos	>= 4.23.0, <= 4.23.1f
Arista	Eos	4.15
Arista	Eos	4.16
Arista	Eos	4.17
Arista	Eos	4.18
Arista	Eos	4.19
Arista	Eos	4.20

References

https://www.arista.com/en/support/advisories-notices/security-advisories/10292-security-advisory-47Patch, Vendor Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/10292-security-advisory-47Patch, Vendor Advisory

Timeline

Published: Apr 16, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-18948?

How severe is CVE-2019-18948?

CVE-2019-18948 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.

How do I fix CVE-2019-18948?

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-2019-18948?

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

Scan your code now

Source: NVD / NIST