CVE-2024-21602 Null dereference in Junos OS Evolved
An unauthenticated attacker can cause a denial of service on Juniper ACX routers by sending specific IPv4 UDP packets that trigger a null pointer dereference.
- 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-2024-21602?
CVE-2024-21602 is a high-severity vulnerability in Juniper Junos Os Evolved, published on 12 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A NULL Pointer Dereference vulnerability in Juniper Networks Junos OS Evolved on ACX7024, ACX7100-32C and ACX7100-48L allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS).
If a specific IPv4 UDP packet is received and sent to the Routing Engine (RE) packetio crashes and restarts which causes a momentary traffic interruption. Continued receipt of such packets will lead to a sustained DoS.
This issue does not happen with IPv6 packets.
This issue affects Juniper Networks Junos OS Evolved on ACX7024, ACX7100-32C and ACX7100-48L:
* 21.4-EVO versions earlier than 21.4R3-S6-EVO; * 22.1-EVO versions earlier than 22.1R3-S5-EVO; * 22.2-EVO versions earlier than 22.2R2-S1-EVO, 22.2R3-EVO; * 22.3-EVO versions earlier than 22.3R2-EVO.
This issue does not affect Juniper Networks Junos OS Evolved versions earlier than 21.4R1-EVO.
Weakness: CWE-476
Which versions are affected by CVE-2024-21602?
It affects 1 product.
Products include Juniper Junos Os Evolved.
How do I fix CVE-2024-21602?
No fix has been published for CVE-2024-21602 yet. Limit exposure of the affected software until one is available.
Is CVE-2024-21602 being exploited?
There is no known exploitation of CVE-2024-21602 in the wild and no public exploit code.
Other vulnerabilities in Juniper Junos Os Evolved
- CVE-2026-21902 Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root
- CVE-2023-28983 Junos OS Evolved: Shell Injection vulnerability in the gNOI server
- CVE-2025-21599 Denial of service in Junos OS Evolved
- CVE-2024-47502 Junos OS Evolved: TCP session state is not always cleared on the Routing Engine leading to DoS
- CVE-2024-39531 Junos OS Evolved: ACX 7000 Series: Protocol specific DDoS configuration affects other protocols
Sources
Also known as GHSA-jjrx-x936-xwh4.