Description
Insufficient option length validation in the IPv6 Router Advertisement parser in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to cause a denial of service (device crash) by sending a crafted Router Advertisement with a truncated PREFIX_INFORMATION option that is smaller than the expected structure size. To mitigate this issue, users should upgrade to the fixed version when available.
CVSS breakdown
CVSS 4.0
Attack Vector
Adjacent
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality (Vulnerable System)
None
Integrity (Vulnerable System)
None
Availability (Vulnerable System)
High
Confidentiality (Subsequent System)
None
Integrity (Subsequent System)
None
Availability (Subsequent System)
None
CVSS 3.1
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- AWS / FreeRTOS-Plus-TCP4.0.0 – 4.2.6
- AWS / FreeRTOS-Plus-TCP4.3.0 – 4.4.1
- AWS / FreeRTOS-Plus-TCP4.2.6 – 4.2.6
- AWS / FreeRTOS-Plus-TCP4.4.1 – 4.4.1
References
- PATCHhttps://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1
- PATCHhttps://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6
- MISChttps://aws.amazon.com/security/security-bulletins/2026-023-aws/
- VENDOR_ADVISORYhttps://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-gffr-xgjg-jh9j