Riskcovery

CVE-2026-57054

Junos OS: MX Series: Web filtering doesn't block specifically formatted URLs

State
Published
Severity
6.9 Medium
Published
Jul 9, 2026
Updated
Jul 10, 2026
Reserved
Jun 23, 2026

Read the record on cve.org

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.

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.

Scores

CVSSScoreVectorSource
4.06.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/AU:Y/RE:Mjuniper
3.15.8 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Njuniper

Weaknesses

  • CWE-706 Use of Incorrectly-Resolved Name or Reference

Affected Products

ProductVersions
Junos OSJuniper Networks
  • before 23.2R2-S7Affected
  • 23.4 to before 23.4R2-S8Affected
  • 24.2 to before 24.2R2-S5Affected
  • 24.4 to before 24.4R2-S4Affected
  • 25.2 to before 25.2R2-S1Affected
  • 25.4 to before 25.4R1-S2, 25.4R2Affected

References

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