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.
Details
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| freertos-plus-tcp | 4.3.0 | 4.4.1 |
References
Similar Threats
- Medium CVE-2026-7422
- Medium CVE-2026-7423
- Medium CVE-2026-7425
- High CVE-2026-7426
- Medium CVE-2025-11616
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