CVE-2026-7424

HIGH

Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP

Title source: cna
STIX 2.1

Description

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.

References (4)

Core 4

Scores

CVSS v3 8.1
EPSS 0.0022
EPSS Percentile 12.7%
Attack Vector ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-191
Status published
Products (5)
amazon/freertos-plus-tcp 4.0.0 - 4.2.6
AWS/FreeRTOS-Plus-TCP 4.0.0 - 4.2.6
AWS/FreeRTOS-Plus-TCP 4.2.6
AWS/FreeRTOS-Plus-TCP 4.3.0 - 4.4.1
AWS/FreeRTOS-Plus-TCP 4.4.1
Published Apr 29, 2026
Tracked Since Apr 30, 2026