CVE-2026-33787

published 2026-04-09

CVE-2026-33787: An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis control daemon (chassisd) of Juniper Networks Junos OS on SRX1500…

medium 6.8 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 E X CR X IR X AR X MAV X MAC X MAT X MPR X MUI X MVC X MVI X MVA X MSC X MSI X MSA X S X AU Y R X V X RE M U X

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.

Affected

7 ranges

Vendor	Product	Version range	Fixed in
juniper	junos_os	—	—
juniper	srx_series	—	—
juniper_networks	junos_os	< 23.2R2-S6	23.2R2-S6
juniper_networks	junos_os	>= 23.4 < 23.4R2-S7	23.4R2-S7
juniper_networks	junos_os	>= 24.2 < 24.2R2-S2	24.2R2-S2
juniper_networks	junos_os	>= 24.4 < 24.4R2	24.4R2
juniper_networks	junos_os	>= 25.2 < 25.2R1-S1, 25.2R2	25.2R1-S1, 25.2R2

CWE-754