Vulnerability · Published Feb 25, 2026 · Assigned by ENISA
CVE-2026-27850Improper verification in Linksys MR9600, Linksys MX4200
High 7.5
In plain English
A high-severity security flaw in MR9600 from Linksys. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 78.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
References
- https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-014.txt third-party-advisory, technical-description