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CVE-2026-27850

Improper verification in Linksys MR9600, Linksys MX4200

Published: Feb 25, 2026Updated: Feb 27, 2026 Sources: CVE List NVD
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.2%
Top 84.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Affected Products

MR9600LinksysNetworking Infrastructure
MX4200LinksysNetworking Infrastructure
linksyscommercialUSNetworking Infrastructureaka linksys by cisco

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-014.txt
syss.de

Timeline

Published
Feb 25, 2026
Last Updated
Feb 27, 2026

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