Juniper Junos OS/Junos OS Evolved Routing Protocol Daemon assertion

Summaryinfo

A vulnerability categorized as critical has been discovered in Juniper Junos OS and Junos OS Evolved. Impacted is an unknown function of the component Routing Protocol Daemon. Executing a manipulation can lead to assertion. This vulnerability is handled as CVE-2025-52964. The attack can only be done within the local network. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Juniper Junos OS and Junos OS Evolved (affected version unknown) and classified as critical. This vulnerability affects an unknown functionality of the component Routing Protocol Daemon. The manipulation with an unknown input leads to a assertion vulnerability. The CWE definition for the vulnerability is CWE-617. The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. As an impact it is known to affect availability. CVE summarizes:

A Reachable Assertion vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). When the device receives a specific BGP UPDATE packet, the rpd crashes and restarts. Continuous receipt of this specific packet will cause a sustained DoS condition. For the issue to occur, BGP multipath with "pause-computation-during-churn" must be configured on the device, and the attacker must send the paths via a BGP UPDATE from a established BGP peer. This issue affects: Junos OS: * All versions before 21.4R3-S7, * from 22.3 before 22.3R3-S3, * from 22.4 before 22.4R3-S5, * from 23.2 before 23.2R2, * from 23.4 before 23.4R2. Junos OS Evolved: * All versions before 21.4R3-S7-EVO, * from 22.3 before 22.3R3-S3-EVO, * from 22.4 before 22.4R3-S5-EVO, * from 23.2 before 23.2R2-EVO, * from 23.4 before 23.4R2-EVO.

The advisory is shared for download at supportportal.juniper.net. This vulnerability was named CVE-2025-52964 since 06/23/2025. The exploitation appears to be easy. The attack can only be done within the local network. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 310753 (Juniper Junos OS Vulnerability (JSA100080)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (310753), EUVD (EUVD-2025-21152) and CERT Bund (WID-SEC-2025-1519). Once again VulDB remains the best source for vulnerability data.

Affected

• Juniper MX Series
• Juniper JUNOS
• Juniper SRX Series
• Juniper Security Director
• Juniper Junos Space

Productinfo

Type

• Router Operating System

Vendor

• Juniper

Name

• Junos OS
• Junos OS Evolved

License

• commercial

Website

• Vendor: https://www.juniper.net/

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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