CVE-2026-25603Public exploit

Root command execution via traversal-named USB partition

Published Feb 24, 2026 · Updated Feb 24, 2026

Path traversal in Linksys MR9600 1.0.4.205530 and MX4200 1.0.13.210200 allows physically proximate attackers to execute commands as root. The /etc/init.d/service_tsmb.sh script constructs a /tmp/anon_smb mount point from an unneutralized USB partition name, so ../ segments redirect the mount into a scheduled-script directory. Exploitation requires a prepared USB drive to be inserted into the router; mounting it under /tmp/cron/cron.everyminute runs attacker-supplied scripts as root within 60 seconds.

CVSS severity6.6
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Linksys MR9600 1.0.4.205530 and MX4200 1.0.13.210200 allows physically proximate attackers to execute commands as root. The /etc/init.d/service_tsmb.sh script constructs a /tmp/anon_smb mount point from an unneutralized USB partition name, so ../ segments redirect the mount into a scheduled-script directory. Exploitation requires a prepared USB drive to be inserted into the router; mounting it under /tmp/cron/cron.everyminute runs attacker-supplied scripts as root within 60 seconds.

The record

CVE
CVE-2026-25603
Published
Feb 24, 2026
Updated
Feb 24, 2026
Vendor
Linksys
Product
MX4200
Classifications
CWE-22, CAPEC-251, T1053.003
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.13.210200

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Linksys · MX4200version=1.0.13.210200
Linksys · MR9600version=1.0.4.205530

Published CVSS scores

6.6CISA-ADPCVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CAPEC-251Local Code Inclusion
T1053.003Cron

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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