CVE-2019-18948 Denial of service in n/a

High 7.5 Published 16 Apr 2020 Updated 5 Aug 2024

Attackers can crash the VxLAN software forwarding agent in Arista EOS by sending malformed ARP packets, causing a denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-18948?

CVE-2019-18948 is a high-severity denial of service vulnerability in n/a, published on 16 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Which versions are affected by CVE-2019-18948?

It affects 1 product.

Products include Arista Eos.

How do I fix CVE-2019-18948?

No fix has been published for CVE-2019-18948 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-18948 being exploited?

There is no known exploitation of CVE-2019-18948 in the wild and no public exploit code.

Sources

Also known as GHSA-5vr9-8c6c-3m96.