CVE-2026-27850

Improper verification in Linksys MR9600, Linksys MX4200

High · published February 25, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
40.7
In the wild
Unconfirmed
What it is

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: 1.0.4.205530; MX4200: 1.0.13.210200.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00483 · 40.7th percentile
Published
2026-02-25T16:58Z
EPSS history
Timeline
  • 25 FEB 16:58Z
    Improper verification in Linksys MR9600, Linksys MX4200
    cvelistv5