OS Command Injection in Linksys MR9600 Router by Cisco
CVE-2026-4558

8.7HIGH

Key Information:

Vendor

Linksys
Status
Mr9600
Vendor
CVE Published:
22 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4558?

A significant vulnerability has been identified in the Linksys MR9600 firmware version 2.0.6.206937. A flaw in the 'smartConnectConfigure' function located in the SmartConnect.lua file allows for OS command injection through manipulation of specific arguments such as configApSsid, configApPassphrase, srpLogin, and srpPassword. This can be executed remotely, making systems utilizing this version of the Linksys MR9600 router particularly susceptible to exploitation. The vendor has been notified of this issue but has not responded to address necessary security measures. Organizations using this router should take immediate action to mitigate potential risks and ensure network safety.

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Affected Version(s)

MR9600 2.0.6.206937

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-4558 - Proof of Concept

References

https://vuldb.com/?id.352385
vdb-entrytechnical-description
https://vuldb.com/?ctiid.352385
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https://vuldb.com/?submit.775036
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

wuuu (VulDB User)
VulDB
JSON
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