CVE-2026-57054: A Use of Incorrectly-Resolved Name or Reference vulnerability in the URL filtering plugin of Juniper Networks

Q: How do I fix CVE-2026-57054?

junos: upgrade to 23.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-57054 being exploited?

CVE-2026-57054 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-57054 affect?

CVE-2026-57054 affects junos. Severity is medium (CVSS 5.8). 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 th

Q: How urgent is CVE-2026-57054?

Priority 33/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.8REMOTEUPGRADE

CVE-2026-57054 is a medium-severity flaw (CVSS 5.8) affecting junos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-706
Published	2026-07-09
Last modified	2026-10-25

Publisher (CNA): Juniper Networks, Inc. · Vendor: juniper

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-09 22:17 UTCPublished CVE record published
2026-10-25 15:10 UTCUpdated Record last modified

juniper junos UPGRADE

Affected: < 23.2 · 23.2 · 23.2 r1 · 23.2 r1-s1 · 23.2 r1-s2 · 23.2 r2 · 23.2 r2-s1 · 23.2 r2-s2

Fixed in: 23.2

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-57054?

junos: upgrade to 23.2. Exact commands for each OS are on this page.

Is CVE-2026-57054 being exploited?

CVE-2026-57054 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-57054 affect?

CVE-2026-57054 affects junos. Severity is medium (CVSS 5.8). 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 th

How urgent is CVE-2026-57054?

Priority 33/100. Remotely exploitable, no login, no user action

Software pages

Juniper Junos vulnerabilities

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References

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