Threat Intelligence Database

Bulletin ID: 2026-023-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/04/29 12:30 PM PDT Description: FreeRTOS-Plus-TCP is an open source TCP/IP stack implementation designed for FreeRTOS, providing a standard Berkeley sockets interface and support for essential networking protocols including IPv6, ARP, DHCP, DNS, and Router Advertisement (RA). We identified CVE-2026-7425 and CVE-2026-7426, one of them being out-of-bounds read and another one being out-of-bounds write issues respectively in the IPv6 Router Advertisement option parser where insufficient validation of length fields allows memory operations without proper bounds checking. Either issue can be exploited by any device on the local network that can send crafted Router Advertisement packets. No authentication or user interaction is required. Impacted versions: >=V4.0.0 AND =V4.3.0 AND <=V4.4.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

Bulletin ID: 2026-022-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/04/29 12:20 PM PDT Description: FreeRTOS-Plus-TCP is an open-source, scalable TCP/IP stack for FreeRTOS. We identified CVE-2026-7424, where an integer underflow issue in the DHCPv6 sub-option parser could allow an adjacent network user to corrupt the device's IPv6 address assignment, DNS configuration, and lease times, and to cause a denial of service (IP task freeze requiring hardware reset). Impacted versions: FreeRTOS-Plus-TCP >=V4.0.0 AND =V4.3.0 AND <= V4.4.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

Bulletin ID: 2026-021-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/04/29 12:00 PM PDT Description: FreeRTOS-Plus-TCP is a scalable, open source, and thread-safe TCP/IP stack for FreeRTOS. - CVE-2026-7422: Insufficient packet validation in the IPv4 and IPv6 receive paths allows an adjacent network device to send a packet that bypasses checksum and minimum-size validation by spoofing the Ethernet source MAC address to match one of the target device's own registered endpoints. - CVE-2026-7423: Integer underflow in the ICMP and ICMPv6 echo reply handlers allows an adjacent network device to cause a denial of service (device crash) when outgoing ping support is enabled, because header sizes are subtracted from a packet length field without validating the field is large enough, resulting in a heap out-of-bounds read. Impacted versions: >=V4.0.0 AND =V4.3.0 AND <=V4.4.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

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.

Integer underflow in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network user to cause a denial of service (device crash) when outgoing ping support is enabled, because header sizes are subtracted from a packet length field without validating the field is large enough, resulting in a heap out-of-bounds read of up to approximately 65KB. To mitigate this issue, users should upgrade to the fixed version when available.