Advisory severityMedium5.5Juniper Networks

Medium [CVE-2026-33787] 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)

This medium-severity Juniper Networks advisory covers CVE-2026-33787; related products: Junos OS, Junos.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-33787 Source published Apr 10, 2026Source updated Jun 17, 2026

VulniPulse record published Jul 5, 2026Record updated Aug 3, 2026

CVE-2026-33787

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Summary

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.

23.2 versions before 23.2R2-S6,
23.4 versions before 23.4R2-S7

Affected versions

23.2
23.4
24.2
24.4
25.2

Official advisory · high-confidence parse· fetched 4 months ago·verify at source

Fixed versions

23.2R2-S6
23.4R2-S7
24.2R2-S2
24.4R2
25.2R1-S1

Official advisory · high-confidence parse· fetched 4 months ago·verify at source

Mitigation

Upgrade to a fixed release: 23.2R2-S6, 23.4R2-S7, 24.2R2-S2, 24.4R2, 25.2R1-S1. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 4 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

NVD discovery recordNVD
Independent discovery and scoring cross-reference. Vendor remediation guidance takes precedence. Discovered from the machine-readable feed https://services.nvd.nist.gov/rest/json/cves/2.0; this link opens the NVD record for CVE-2026-33787 instead of the raw feed document.
NIST National Vulnerability Database

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-33787NVD CVE.org MITRE

Official resources

Junos OS software downloads & install/upgrade (target: 23.2R2-S6 / 23.4R2-S7 / 24.2R2-S2)
Official documentation
This advisory names 23.2R2-S6 / 23.4R2-S7 / 24.2R2-S2 as the first fixed releases — official upgrade documentation for Junos OS on SRX / MX / EX / QFX.
Junos OS release & EOL / support dates
Release notes
Confirm your train is still supported and pick a fixed maintenance release.
Juniper Security Advisories portal
Official documentation
Canonical Juniper SIRT advisory portal — search here for the full JSA text and revisions.

Discussion(0)

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