What is CVE-2026-27850?

CVE-2026-27850 is a high-severity vulnerability in Linksys Mr9600, classified under CWE-940 IMPROPER VERIFICATION OF SOURCE OF A COMMUNICATION CHANNEL. CVSS score: 7.5/10. Published 2026-02-25.

How severe is CVE-2026-27850?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Linksys Mr9600

CVE-2026-27850

Due to an improperly configured firewall rule, the router will accept any connection on the WAN port with the source port 5222, exposing all services which are normally only accessible through the local network. This issue affects MR9600…

EPSS: 0.002 (15.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Linksys Mr9600 — versions 1.0.4.205530
Linksys Mx4200 — versions 1.0.13.210200

References

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

Frequently asked questions

What is CVE-2026-27850?: CVE-2026-27850 is a high-severity vulnerability in Linksys Mr9600, classified under CWE-940 IMPROPER VERIFICATION OF SOURCE OF A COMMUNICATION CHANNEL. CVSS score: 7.5/10. Published 2026-02-25.
How severe is CVE-2026-27850?: High severity. CVSS v3 base score is 7.5 out of 10.