CVE-2026-33787 Junos OS: SRX1500, SRX4100, SRX4200, SRX4600: When a specific show command is executed chassisd crashes

Medium 6.8 Published 9 Apr 2026 Updated 13 Apr 2026

A local attacker with low privileges can crash the chassis daemon via a specific CLI command, causing a temporary denial of service on Juniper SRX devices.

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

What is CVE-2026-33787?

CVE-2026-33787 is a medium-severity denial of service vulnerability in Juniper Junos, published on 9 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis control daemon (chassisd) of Juniper Networks Junos OS on SRX1500, SRX4100, SRX4200 and SRX4600 allows a local attacker with low privileges to cause a complete Denial of Service (DoS).

When a specific 'show chassis' CLI command is executed, chassisd crashes and restarts which causes a momentary impact to all traffic until all modules are online again.

This issue affects Junos OS on SRX1500, SRX4100, SRX4200 and SRX4600:

* 23.2 versions before 23.2R2-S6, * 23.4 versions before 23.4R2-S7 * 24.2 versions before 24.2R2-S2, * 24.4 versions before 24.4R2, * 25.2 versions before 25.2R1-S1, 25.2R2.

Weakness: CWE-754

Which versions are affected by CVE-2026-33787?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2026-33787?

No fix has been published for CVE-2026-33787 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-2026-33787 being exploited?

There is no known exploitation of CVE-2026-33787 in the wild and no public exploit code.

All Juniper Junos vulnerabilities

Sources

Also known as GHSA-w7w4-rh54-5rf6.