Description
Insufficient validation of the prefix length field in IPv6 Router Advertisement processing in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to cause memory corruption by sending a crafted Router Advertisement with a prefix length value exceeding the maximum valid length, resulting in a heap buffer overflow. Users processing IPv4 RA only are not impacted. 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)
High
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
High
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-97qg-4359-xm3x