CVE-2026-33787 PUBLISHED

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

Assigner: juniper
Reserved: 23.03.2026 Published: 09.04.2026 Updated: 09.04.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/RE:M
CVSS Score: 6.8

Product Status

Vendor Juniper Networks
Product Junos OS
Versions Default: unaffected
  • affected from 0 to 23.2R2-S6 (excl.)
  • affected from 23.4 to 23.4R2-S7 (excl.)
  • affected from 24.2 to 24.2R2-S2 (excl.)
  • affected from 24.4 to 24.4R2 (excl.)
  • affected from 25.2 to 25.2R1-S1, 25.2R2 (excl.)

Exploits

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

Workarounds

Use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.

Utilize CLI authorization to disallow execution of the 'show chassis' command.

Solutions

The following software releases have been updated to resolve this specific issue: 23.2R2-S6, 23.4R2-S7, 24.2R2-S2, 24.4R2, 25.2R1-S1, 25.2R2, 25.4R1, and all subsequent releases.

References

Problem Types

  • CWE-754 Improper Check for Unusual or Exceptional Conditions CWE