What is CVE-2026-27849?

CVE-2026-27849 is a critical-severity vulnerability in Linksys Mr9600, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-02-25.

How severe is CVE-2026-27849?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Linksys Mr9600

CVE-2026-27849

Due to missing neutralization of special elements, OS commands can be injected via the update functionality of a TLS-SRP connection, which is normally used for configuring devices inside the mesh network. This issue affects MR9600: 1.0.4.2…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.003 (23.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linksys Mr9600 — versions 1.0.4.205530
Linksys Mx4200 — versions 1.0.13.210200

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 (technical-description, third-party-advisory)

Frequently asked questions

What is CVE-2026-27849?: CVE-2026-27849 is a critical-severity vulnerability in Linksys Mr9600, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-02-25.
How severe is CVE-2026-27849?: Critical severity. CVSS v3 base score is 9.8 out of 10.