CVE-2026-33787 — MEDIUM (5.5)

Vulnerability Description

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.

CVSS Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Juniper	Junos	23.2
Juniper	Srx1500	-
Juniper	Srx4100	-
Juniper	Srx4200	-
Juniper	Srx4600	-

Related Weaknesses (CWE)

CWE-754

References

https://kb.juniper.net/JSA107873MitigationVendor Advisory

FAQ

What is CVE-2026-33787?

CVE-2026-33787 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 atta...

How severe is CVE-2026-33787?

CVE-2026-33787 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-33787?

Check the references section above for vendor advisories and patch information. Affected products include: Juniper Junos, Juniper Srx1500, Juniper Srx4100, Juniper Srx4200, Juniper Srx4600.