Juniper Junos OS up to 25.2R1-S1 CLI Command unusual condition

Summaryinfo

A vulnerability was found in Juniper Junos OS up to 25.2R1-S1. It has been declared as problematic. Affected by this issue is some unknown functionality of the component CLI Command Handler. Executing a manipulation can lead to unusual condition. This vulnerability appears as CVE-2026-33787. The attack requires local access. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Juniper Junos OS up to 25.2R1-S1. This vulnerability affects some unknown processing of the component CLI Command Handler. The manipulation with an unknown input leads to a unusual condition vulnerability. The CWE definition for the vulnerability is CWE-754. The product 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 product. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is available at kb.juniper.net. This vulnerability was named CVE-2026-33787 since 03/23/2026. The exploitation appears to be easy. Local access is required to approach this attack. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/10/2026).

Upgrading to version 23.2R2-S6, 23.4R2-S7, 24.2R2-S2, 24.4R2, 25.2R1-S1 or 25.2R2 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Router Operating System

Vendor

• Juniper

Name

• Junos OS

Version

• 23.2R2-S5
• 23.4R2-S6
• 24.2R2-S1
• 24.4R1
• 25.2R1
• 25.2R1-S1

License

• commercial

Website

• Vendor: https://www.juniper.net/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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