TI-2026-22200 Aliases CVE-2026-27850 GHSA-j57x-8g4m-v9v5

Improper verification in Linksys MR9600, Linksys MX4200

HIGH 72Published 2026-02-25 · Updated 2026-02-25

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00284 21st percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Linksys	MR9600	1.0.4.205530 and later	—	No fix listed	CNA
Linksys	MX4200	1.0.13.210200	—	No fix listed	CNA

MR9600 VendorLinksys Affected 1.0.4.205530 and later Fixed in — No fix listed CNA
MX4200 VendorLinksys Affected 1.0.13.210200 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-27850
2026-10-03 Alias added: GHSA-j57x-8g4m-v9v5

References

Advisory 1

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

TI-2025-24206 Linksys Routers E/WAG/WAP/WES/WET/WRT-Series CVSS 4.0CRITICAL 10.0
TI-2017-12715 OS command injection in Linksys WVBR0 CVSS 3.0CRITICAL 9.8
TI-2026-70977 Stack-based buffer overflow in Linksys E1700 Mac Filter CVSS 4.0CRITICAL 10.0
TI-2026-22199 Missing neutralization in Linksys MR9600, Linksys MX4200 CVSS 3.1CRITICAL 9.8
TI-2026-22198 Missing neutralization in Linksys MR9600, Linksys MX4200 CVSS 3.1CRITICAL 9.8
TI-2026-22197 Missing authentication in Linksys MR9600, Linksys MX4200 CVSS 3.1CRITICAL 9.8

See all 253 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences