Juniper Junos OS up to 22.4R2 Packet Forwarding Engine unusual condition

Summaryinfo

A vulnerability labeled as critical has been found in Juniper Junos OS up to 21.4R3-S7.8/22.1R3-S5.2/22.2R3-S4.10/22.3R2/22.4R2. This issue affects some unknown processing of the component Packet Forwarding Engine. Such manipulation leads to unusual condition. This vulnerability is listed as CVE-2024-21586. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Juniper Junos OS up to 21.4R3-S7.8/22.1R3-S5.2/22.2R3-S4.10/22.3R2/22.4R2. It has been rated as critical. Affected by this issue is an unknown part of the component Packet Forwarding Engine. The manipulation with an unknown input leads to a unusual condition vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability. CVE summarizes:

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series and NFX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). If an affected device receives specific valid traffic destined to the device, it will cause the PFE to crash and restart. Continued receipt and processing of this traffic will create a sustained DoS condition. This issue affects Junos OS on SRX Series: * 21.4 versions before 21.4R3-S7.9, * 22.1 versions before 22.1R3-S5.3, * 22.2 versions before 22.2R3-S4.11, * 22.3 versions before 22.3R3, * 22.4 versions before 22.4R3. This issue affects Junos OS on NFX Series: * 21.4 versions before 21.4R3-S8, * 22.1 versions after 22.1R1, * 22.2 versions before 22.2R3-S5, * 22.3 versions before 22.3R3, * 22.4 versions before 22.4R3. Junos OS versions prior to 21.4R1 are not affected by this issue.

The advisory is available at supportportal.juniper.net. This vulnerability is handled as CVE-2024-21586 since 12/27/2023. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. 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 01/23/2026).

Upgrading to version 21.4R3-S7.9, 22.1R3-S5.3, 22.2R3-S4.11, 22.3R3 or 22.4R3 eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Juniper

Name

• Junos OS

Version

• 21.4R3-S7.0
• 21.4R3-S7.1
• 21.4R3-S7.2
• 21.4R3-S7.3
• 21.4R3-S7.4
• 21.4R3-S7.5
• 21.4R3-S7.6
• 21.4R3-S7.7
• 21.4R3-S7.8
• 22.1R3-S5.0
• 22.1R3-S5.1
• 22.1R3-S5.2
• 22.2R3-S4.0
• 22.2R3-S4.1
• 22.2R3-S4.2
• 22.2R3-S4.3
• 22.2R3-S4.4
• 22.2R3-S4.5
• 22.2R3-S4.6
• 22.2R3-S4.7
• 22.2R3-S4.8
• 22.2R3-S4.9
• 22.2R3-S4.10
• 22.3R2
• 22.4R2

License

• commercial

Website

• Vendor: https://www.juniper.net/

CPE 2.3info

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