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 affecting Junos OS, Junos.
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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
- 23.2
- 23.4
- 24.2
- 24.4
- 25.2
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 23.2R2-S6
- 23.4R2-S7
- 24.2R2-S2
- 24.4R2
- 25.2R1-S1
Official advisory · high-confidence parse· fetched 2 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 2 months ago·verify at source
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