CVE-2019-18948

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-04-16 · updated 2026-06-17

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.

Affected products

Arista Networks EOS: from 4.21.0 through 4.21.8m; from 4.22.0 through 4.22.3m; from 4.23.0 through 4.23.1f; 4.15, 4.16, 4.17, 4.18, 4.19, 4.20

References

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

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