CVE-2026-66279 PUBLISHED

Dis-connect vulnerability in Connect Stack

Assigner: Silabs
Reserved: 24.07.2026 Published: 22.10.2026 Updated: 22.10.2026

In Connect SDK 4.3.1 and earlier and Flex SDK 3.7.7 and earlier, a message with invalid security settings may bypass authentication resulting in network disruption. This vulnerability does not allow an attacker to gain the Network Key or otherwise break confidentiality.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 7.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Silicon Labs
Product	Connect SDK
Versions	Default: unaffected affected from 4.0.0 to 4.3.1 (incl.) affected from 0 to 3.7.7 (incl.)

Credits

414B reporter

References

Problem Types

CWE-940: Improper Verification of Source of a Communication Channel CWE

Impacts

CAPEC-115: Authentication Bypass, CAPEC-176: Configuration/Environment Manipulation