Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-7424— Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP

Quick assessment

Affected
AWS FreeRTOS-Plus-TCP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 8.1 · High EPSS 0.37% · P29

Affected Version Matrix 4

VendorProduct Version RangeStatus
AWS FreeRTOS-Plus-TCP 4.0.0< 4.2.6 affected
4.3.0< 4.4.1 affected
4.2.6 unaffected
4.4.1 unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-7424

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
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
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-7424

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-7424 (2)

Vendor Pages for CVE-2026-7424 (2)

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
Same vendor: AWS
Same weakness: CWE-191

V. Comments for CVE-2026-7424

No comments yet

Leave a comment