HIGHCVE-2026-7424Published Modified CNA AMZN
CVE-2026-7424: Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP
Integer underflow in the DHCPv6 sub-option parser in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network actor to corrupt the device's IPv6 address assignment, DNS configuration, and lease times, and to cause a denial of service (permanent IP task freeze requiring hardware reset) by sending a single crafted DHCPv6 packet. The issue is present whenever DHCPv6 is enabled. To mitigate this issue, users should upgrade to version V4.2.6 or V4.4.1 or newer.
Metrics
- CVSS v4.0
- 7.2
- Severity
- HIGH
- Fixed in
- 4.2.6
- Affected Products
- 1
Affected packages
- AWS / FreeRTOS-Plus-TCP< 4.2.6 (from 4.0.0) · < 4.4.1 (from 4.3.0)Fixed in 4.2.6, 4.4.1
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