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MEDIUM · 5.8

CVE-2026-57054

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 filt...

Vulnerability 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.

CVSS Score

5.8

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE

Affected Products

VendorProductVersions
JuniperJunos< 23.2
JuniperMx10004-
JuniperMx10008-
JuniperMx2008-
JuniperMx2010-
JuniperMx2020-
JuniperMx204-
JuniperMx240-
JuniperMx301-
JuniperMx304-
JuniperMx480-
JuniperMx960-

Related Weaknesses (CWE)

CWE-706

References

FAQ

What is CVE-2026-57054?

CVE-2026-57054 is a vulnerability with a CVSS score of 5.8 (MEDIUM). 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 filt...

How severe is CVE-2026-57054?

CVE-2026-57054 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-57054?

Check the references section above for vendor advisories and patch information. Affected products include: Juniper Junos, Juniper Mx10004, Juniper Mx10008, Juniper Mx2008, Juniper Mx2010.