Juniper Junos OS up to 25.4R1-S2 URL Filtering redirect

Summaryinfo

A vulnerability labeled as problematic has been found in Juniper Junos OS up to 25.4R1-S2. This affects an unknown function of the component URL Filtering. The manipulation results in redirect. This vulnerability is reported as CVE-2026-57054. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic has been found in Juniper Junos OS up to 25.4R1-S2. Affected is an unknown part of the component URL Filtering. The manipulation with an unknown input leads to a redirect vulnerability. CWE is classifying the issue as CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. This is going to have an impact on integrity. CVE summarizes:

A Use of Incorrectly-Resolved Name or Reference vulnerability in the URL filtering plugin of Juniper Networks Junos OS on MX Series allows an unauthenticated, network-based attacker to bypass web filtering and access downstream resources that should be unreachable. If an MX Series device is configured with web filtering, and an attacker sends a request with a specifically formatted URL, this request will get forwarded despite the system being configured to block it. In turn, an attacker can access downstream resources that are expected to be unreachable. This issue affects Junos OS on MX Series: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S8, * 24.2 versions before 24.2R2-S5, * 24.4 versions before 24.4R2-S4, * 25.2 versions before 25.2R2-S1, * 25.4 versions before 25.4R1-S2, 25.4R2.

The advisory is shared for download at supportportal.juniper.net. This vulnerability is traded as CVE-2026-57054 since 06/23/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/10/2026). The MITRE ATT&CK project declares the attack technique as T1204.001.

Upgrading to version 23.2R2-S7, 23.4R2-S8, 24.2R2-S5, 24.4R2-S4, 25.2R2-S1, 25.4R1-S2 or 25.4R2 eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Juniper

Name

• Junos OS

Version

• 23.2R2-S6
• 23.4R2-S7
• 24.2R2-S4
• 24.4R2-S3
• 25.2R2-S0
• 25.4R1
• 25.4R1-S2

License

• commercial

Website

• Vendor: https://www.juniper.net/

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