CVE-2026-33787: An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis control daemon (chassisd) of…

CVE-2026-33787 · Severity: medium · CVSS 5.5 · Published 2026-04-09

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.

Technologies: Juniper Junos. Vendors: Juniper.

Quick answers

Is CVE-2026-33787 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-33787 being exploited in the wild.
How severe is CVE-2026-33787?
Medium severity, with a CVSS score of 5.5, published 9 April 2026.
Which products and versions are affected?
Juniper Junos, Juniper Srx1500, Juniper Srx4100, Juniper Srx4200 and 1 more. The advisory does not name versions.
Is there a fix for CVE-2026-33787?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-33787?
Check whether you run Juniper Junos, Juniper Srx1500, Juniper Srx4100 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Juniper Junos
  • Juniper Srx1500
  • Juniper Srx4100
  • Juniper Srx4200
  • Juniper Srx4600

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