CVE-2022-22171 Junos OS: Specific packets over VXLAN cause FPC reset

High 7.5 Published 19 Jan 2022 Updated 16 Sep 2024

Unauthenticated attackers can cause a Denial of Service by sending specific VXLAN packets that reset the Packet Forwarding Engine in Juniper Junos OS.

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-2022-22171?

CVE-2022-22171 is a high-severity denial of service vulnerability in Juniper Junos, published on 19 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows an unauthenticated networked attacker to cause a Denial of Service (DoS) by sending specific packets over VXLAN which cause the PFE to reset. This issue affects: Juniper Networks Junos OS 19.4 versions prior to 19.4R3-S7; 20.1 versions prior to 20.1R3-S3; 20.2 versions prior to 20.2R3-S3; 20.3 versions prior to 20.3R3-S2; 20.4 versions prior to 20.4R3-S1; 21.1 versions prior to 21.1R3; 21.2 versions prior to 21.2R2; 21.3 versions prior to 21.3R1-S1, 21.3R2. This issue does not affect versions of Junos OS prior to 19.4R1.

Weakness: CWE-754

Which versions are affected by CVE-2022-22171?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2022-22171?

No fix has been published for CVE-2022-22171 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-2022-22171 being exploited?

There is no known exploitation of CVE-2022-22171 in the wild and no public exploit code.

All Juniper Junos vulnerabilities

Sources

Also known as GHSA-3vqf-rm2x-wv2w.