| Summary | 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. |
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| Publication Date | April 30, 2026, 4:16 a.m. |
| Registration Date | May 1, 2026, 4:06 a.m. |
| Last Update | May 1, 2026, 12:13 a.m. |
| CVSS3.1 : HIGH | |
| スコア | 8.1 |
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| Vector | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
| 攻撃元区分(AV) | 隣接 |
| 攻撃条件の複雑さ(AC) | 低 |
| 攻撃に必要な特権レベル(PR) | 不要 |
| 利用者の関与(UI) | 不要 |
| 影響の想定範囲(S) | 変更なし |
| 機密性への影響(C) | なし |
| 完全性への影響(I) | 高 |
| 可用性への影響(A) | 高 |