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

Source: https://junglewise.ai/threats/cve-2026-33787-an-improper-check-for-unusual-or-exceptional-conditions  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-09  
License: CC BY 4.0 with a link back

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](https://junglewise.ai/threats/technologies/junos). Vendors: [Juniper](https://junglewise.ai/threats/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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