Vulnerability in Juniper Junos
CVE-2026-33786
An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis control daemon (chassisd) of Juniper Networks Junos OS on SRX1600, SRX2300 and SRX4300 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 SRX1600, SRX2300 and SRX4300: * 24.4 versions before 24.4R1-S3, 24.4R2. This issue does not affect Junos OS versions before 24.4R1.
EPSS: 0.001 (0.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Juniper Junos — versions 24.4
- Juniper Srx1600
- Juniper Srx2300
- Juniper Srx4300
- Juniper Networks Junos Os — versions 24.4
Weakness classification (CWE)
References
- sirt@juniper.net (vendor-advisory, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-33786?
- CVE-2026-33786 is a medium-severity vulnerability in Juniper Junos, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 5.5/10. Published 2026-04-09.
- How severe is CVE-2026-33786?
- Medium severity. CVSS v3 base score is 5.5 out of 10.