CVE-2024-21586 Junos OS: SRX Series and NFX Series: Specific valid traffic leads to a PFE crash
An unauthenticated attacker can cause a Packet Forwarding Engine crash and restart by sending specific valid traffic, resulting in a sustained Denial-of-Service.
- 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-2024-21586?
CVE-2024-21586 is a high-severity denial of service vulnerability in Juniper Junos, published on 1 Jul 2024. 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 on SRX Series and NFX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
If an affected device receives specific valid traffic destined to the device, it will cause the PFE to crash and restart. Continued receipt and processing of this traffic will create a sustained DoS condition.
This issue affects Junos OS on SRX Series:
* 21.4 versions before 21.4R3-S7.9, * 22.1 versions before 22.1R3-S5.3, * 22.2 versions before 22.2R3-S4.11, * 22.3 versions before 22.3R3, * 22.4 versions before 22.4R3.
This issue affects Junos OS on NFX Series:
* 21.4 versions before 21.4R3-S8, * 22.1 versions after 22.1R1, * 22.2 versions before 22.2R3-S5, * 22.3 versions before 22.3R3, * 22.4 versions before 22.4R3.
Junos OS versions prior to 21.4R1 are not affected by this issue.
Weakness: CWE-754
Which versions are affected by CVE-2024-21586?
It affects 1 product.
Products include Juniper Junos.
How do I fix CVE-2024-21586?
No fix has been published for CVE-2024-21586 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-2024-21586 being exploited?
There is no known exploitation of CVE-2024-21586 in the wild and no public exploit code.
Other vulnerabilities in Juniper Junos
- CVE-2023-36845 Juniper Junos OS EX Series and SRX Series PHP External Variable Modification
- CVE-2020-1631 Juniper Junos OS Path Traversal
- CVE-2025-21590 Juniper Junos OS Improper Isolation or Compartmentalization
- CVE-2023-36851 Juniper Junos OS SRX Series Missing Authentication for Critical Function
- CVE-2023-36844 Juniper Junos OS EX Series PHP External Variable Modification
Sources
Also known as GHSA-w2xf-42w4-qqrc.