CVE-2021-0209 Junos OS Evolved: Receipt of certain valid BGP update packets from BGP peers may cause RPD to core when using REGEX.

Medium 6.5 Published 15 Jan 2021 Updated 17 Sep 2024

An attacker can cause a denial of service in Junos OS Evolved by sending specific BGP packets when REGEX is used, crashing the routing process.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-0209?

CVE-2021-0209 is a medium-severity vulnerability in Juniper Junos Os Evolved, published on 15 Jan 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In Juniper Networks Junos OS Evolved an attacker sending certain valid BGP update packets may cause Junos OS Evolved to access an uninitialized pointer causing RPD to core leading to a Denial of Service (DoS). Continued receipt of these types of valid BGP update packets will cause an extended Denial of Service condition. RPD will require a restart to recover. An indicator of compromise is to see if the file rpd.re exists by issuing the command: show system core-dumps This issue affects: Juniper Networks Junos OS Evolved 19.4 versions prior to 19.4R2-S2-EVO; 20.1 versions prior to 20.1R1-S2-EVO, 20.1R2-S1-EVO. This issue does not affect Junos OS.

Weakness: CWE-824

Which versions are affected by CVE-2021-0209?

It affects 1 product.

Products include Juniper Junos Os Evolved.

How do I fix CVE-2021-0209?

No fix has been published for CVE-2021-0209 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-0209 being exploited?

There is no known exploitation of CVE-2021-0209 in the wild and no public exploit code.

All Juniper Junos Os Evolved vulnerabilities

Sources

Also known as GHSA-gp8q-5m2c-vprm.