How severe is CVE-2026-25603?

CVE-2026-25603 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-25603 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25603?

CVE-2026-25603 primarily affects Linksys Mr9600 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-25603?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-25603 have an EU (EUVD) identifier?

Yes. CVE-2026-25603 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8547.

When was CVE-2026-25603 published?

CVE-2026-25603 was published on 2026-02-24 and last updated on 2026-06-17.

CVE-2026-25603

CVE-2026-25603 is a medium-severity vulnerability in Linksys Mr9600 Firmware with a CVSS 3.x base score of 6.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.6)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8547
Weakness: CWE-22
Affected product: Linksys Mr9600 Firmware
Published: 2026-02-24
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-25603?: 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.
How severe is CVE-2026-25603?: CVE-2026-25603 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-25603 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25603?: CVE-2026-25603 primarily affects Linksys Mr9600 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-25603?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-25603 have an EU (EUVD) identifier?: Yes. CVE-2026-25603 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8547.
When was CVE-2026-25603 published?: CVE-2026-25603 was published on 2026-02-24 and last updated on 2026-06-17.

References

https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-001.txt

Affected products (2)

cpe:2.3:o:linksys:mr9600_firmware:1.0.4.205530:*:*:*:*:*:*:*
cpe:2.3:o:linksys:mx4200_firmware:1.0.4.205530:*:*:*:*:*:*:*

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