CVE-2026-7424— Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP
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I. Basic Information for CVE-2026-7424
Vulnerability Information
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Vulnerability Title
Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数下溢(超界折返)
Source: NVD (National Vulnerability Database)
Vulnerability Title
FreeRTOS-Plus-TCP 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRTOS-Plus-TCP是FreeRTOS开源的一种适用于 FreeRTOS 的可扩展的开源和线程安全 TCP/IP 堆栈。 FreeRTOS-Plus-TCP V4.4.1之前版本和V4.2.6之前版本存在数字错误漏洞，该漏洞源于DHCPv6子选项解析器中的整数下溢，可能导致相邻网络参与者破坏设备IPv6地址分配、DNS配置和租约时间，并造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| AWS | FreeRTOS-Plus-TCP | 4.0.0 ~ 4.2.6 | - |
II. Public POCs for CVE-2026-7424
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · AWS · 2026-04-29 · 5 CVEs total
| CVE-2026-7426 | 8.1 HIGH | Out-of-Bounds Write via Unsanitized Prefix Length in Router Advertisement Processing in Fr |
| CVE-2026-7422 | 6.5 MEDIUM | MAC Address Validation Bypass in FreeRTOS-Plus-TCP IPv4 and IPv6 Packet Processing |
| CVE-2026-7425 | 6.5 MEDIUM | Out-of-Bounds Read in Router Advertisement Option Parser in FreeRTOS-Plus-TCP |
| CVE-2026-7423 | 5.3 MEDIUM | Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP |
IV. Related Vulnerabilities
Same product: FreeRTOS-Plus-TCP
- CVE-2026-7426
Out-of-Bounds Write via Unsanitized Prefix Length in Router - CVE-2026-7425
Out-of-Bounds Read in Router Advertisement Option Parser in - CVE-2026-7423
Integer Underflow in ICMP Echo Reply Processing in FreeRTOS- - CVE-2026-7422
MAC Address Validation Bypass in FreeRTOS-Plus-TCP IPv4 and - CVE-2025-11618
Invalid Pointer Dereference when receiving UDP/IPv6 packets
Same vendor: AWS
- CVE-2026-7461
OS Command Injection in Amazon ECS Agent via FSx Windows Fil - CVE-2026-7426
Out-of-Bounds Write via Unsanitized Prefix Length in Router - CVE-2026-7425
Out-of-Bounds Read in Router Advertisement Option Parser in - CVE-2026-7423
Integer Underflow in ICMP Echo Reply Processing in FreeRTOS- - CVE-2026-7422
MAC Address Validation Bypass in FreeRTOS-Plus-TCP IPv4 and
Same weakness: CWE-191
- CVE-2026-7736
osrg GoBGP mrt.go parseRibEntry integer underflow - CVE-2026-33845
Gnutls: gnutls: denial of service via dtls zero-length fragm - CVE-2026-7423
Integer Underflow in ICMP Echo Reply Processing in FreeRTOS- - CVE-2026-6914
MD5 checksum creation may cause availability loss - CVE-2026-40356
MIT Kerberos 数字错误漏洞
V. Comments for CVE-2026-7424
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