CVE-2026-57054
Severity CVSS v4.0:
MEDIUM
Type:
Unavailable / Other
Publication date:
09/07/2026
Last modified:
10/07/2026
Description
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.<br />
<br />
<br />
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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.<br />
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This issue affects Junos OS on MX Series:<br />
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<br />
* all versions before 23.2R2-S7,<br />
* 23.4 versions before 23.4R2-S8,<br />
* 24.2 versions before 24.2R2-S5,<br />
* 24.4 versions before 24.4R2-S4,<br />
* 25.2 versions before 25.2R2-S1,<br />
* 25.4 versions before 25.4R1-S2, 25.4R2.
Impact
Base Score 4.0
6.90
Severity 4.0
MEDIUM
Base Score 3.x
5.80
Severity 3.x
MEDIUM