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Medium5.8Juniper Networks

Medium [CVE-2026-57054] 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

This medium-severity Juniper Networks advisory covers CVE-2026-57054 affecting Junos OS, Junos, MX.

CVE-2026-57054 Published Jul 9, 2026Updated by vendor Jul 13, 2026
CVE-2026-57054
Affected products & platforms
Juniper NetworksRoutersJunosMX / Routers
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Summary

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,

Affected products named by the advisory: MX.

Affected products named by the advisory: MX.

Affected versions
  • * all versions before 23

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • 23.2R2-S7
  • 23.4R2-S8
  • 24.2R2-S5
  • 24.4R2-S4
  • 25.2R2-S1
  • 25.4R1-S2

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Temporary workarounds
  • 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.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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