CVE-2026-33787

EUVD-2026-21205

09.04.2026, 22:16

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	5.5 MEDIUM	LOCAL	LOW	LOW	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Awaiting analysis

This vulnerability is currently awaiting analysis.

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Common Weakness Enumeration

CWE-754 - Improper Check for Unusual or Exceptional Conditions
The software does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the software.

References

https://kb.juniper.net/JSA107873