CVE-2024-21616 Information

Description

An Improper Validation of Syntactic Correctness of Input vulnerability in Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows an unauthenticated network-based attacker to cause Denial of Service (DoS).

On all Junos OS MX Series and SRX Series platforms when SIP ALG is enabled and a specific SIP packet is received and processed NAT IP allocation fails for genuine traffic which causes Denial of Service (DoS). Continuous receipt of this specific SIP ALG packet will cause a sustained DoS condition.

NAT IP usage can be monitored by running the following command.

user@srx> show security nat resource-usage source-pool <source_pool_name>

Pool name: source_pool_name .. Address Factor-index Port-range Used Avail Total Usage X.X.X.X 0 Single Ports 50258 52342 62464 96% ««<

• Alg Ports 0 2048 2048 0% This issue affects:

Juniper Networks Junos OS on MX Series and SRX Series

All versions earlier than 21.2R3-S6;
21.3 versions earlier than 21.3R3-S5;
21.4 versions earlier than 21.4R3-S5;
22.1 versions earlier than 22.1R3-S4;
22.2 versions earlier than 22.2R3-S3;
22.3 versions earlier than 22.3R3-S1;
22.4 versions earlier than 22.4R2-S2 22.4R3;
23.2 versions earlier than 23.2R1-S1 23.2R2.

Reference

https://supportportal.juniper.net/JSA75757 https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N