CVE-2026-25603: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Linksys MR9600

Routine

MEDIUM 6.6MITIGATEMITIGATE

CVE-2026-25603 is a medium-severity flaw (CVSS 6.6) affecting mr9600 firmware, mx4200 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Linksys MR9600, Linksys MX4200 allows that contents of a USB drive partition can be mounted in an arbitrary location of the file system. This may result in the execution of shell scripts in the context of a root user.This issue affects MR9600: 1.0.4.205530; MX4200: 1.0.13.210200.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.6 (Medium)
Attack vector	Physical
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-02-24
Last modified	2026-06-17

Publisher (CNA): ENISA · Vendor: linksys

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-24 18:29 UTCPublished CVE record published
2026-06-17 10:24 UTCUpdated Record last modified

linksys mr9600 firmware MITIGATE

Affected: 1.0.4.205530

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.4.205530

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.

linksys mx4200 firmware MITIGATE

Affected: 1.0.4.205530

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.4.205530

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-2026-25603?

mr9600 firmware: mitigate or apply the listed mitigation; mx4200 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-25603 being exploited?

CVE-2026-25603 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-2026-25603 affect?

CVE-2026-25603 affects mr9600 firmware, mx4200 firmware. Severity is medium (CVSS 6.6). Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Linksys MR9600, Linksys MX4200 allows that contents of a USB drive partition can be mounted in an arbitrary location of the file system. This ma

How urgent is CVE-2026-25603?

Priority 34/100. Public exploit reference

Related CVEs

CVE-2026-6992 HIGH 7.2 MITIGATE A vulnerability was identified in Linksys MR9600 2.0.6.206937
CVE-2026-4558 HIGH 8.8 MITIGATE A flaw has been found in Linksys MR9600 2.0.6.206937

References

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