An Incomplete Cleanup vulnerability in Nonstop active routing (NSR) component of Juniper Networks Junos OS allows an adjacent, unauthenticated attacker to cause memory leak leading to Denial of Service (DoS).

On all Junos OS platforms, when NSR is enabled, a BGP flap will cause memory leak. A manual reboot of the system will restore the services.

The memory usage can be monitored using the below commands.

user@host> show chassis routing-engine no-forwarding
user@host> show system memory | no-more
This issue affects:

Juniper Networks Junos OS

• 21.2 versions earlier than 21.2R3-S5;
• 21.3 versions earlier than 21.3R3-S4;
• 21.4 versions earlier than 21.4R3-S4;
• 22.1 versions earlier than 22.1R3-S2;
• 22.2 versions earlier than 22.2R3-S2;
• 22.3 versions earlier than 22.3R2-S1, 22.3R3;
• 22.4 versions earlier than 22.4R1-S2, 22.4R2.

This issue does not affect Junos OS versions earlier than 20.4R3-S7.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-21617
• https://supportportal.juniper.net/JSA75758
• https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N