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CVE-2026-7422— MAC Address Validation Bypass in FreeRTOS-Plus-TCP IPv4 and IPv6 Packet Processing

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 V4.2.6之前版本和V4.4.1之前版本存在安全漏洞，该漏洞源于数据包验证不足，可能导致相邻网络参与者通过伪造以太网源MAC地址绕过所有校验和及最小大小验证。

CVSS 6.5 · Medium EPSS 0.29% · P19

Possible ATT&CK Techniques 1 AI

T1041 · Exfiltration Over C2 Channel

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
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I. Basic Information for CVE-2026-7422

Vulnerability Information
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Vulnerability Title
MAC Address Validation Bypass in FreeRTOS-Plus-TCP IPv4 and IPv6 Packet Processing
Source: CVE Program / CVE List V5
Vulnerability Description
Insufficient packet validation in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to bypass all checksum and minimum-size validation by spoofing the Ethernet source MAC address to match one of the device's own registered endpoints, because the loopback detection mechanism skips all input validation for packets whose source MAC matches a local endpoint. To mitigate this issue, users should upgrade to the fixed version when available.
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:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRTOS-Plus-TCP 安全漏洞
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 V4.2.6之前版本和V4.4.1之前版本存在安全漏洞，该漏洞源于数据包验证不足，可能导致相邻网络参与者通过伪造以太网源MAC地址绕过所有校验和及最小大小验证。
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-2026-7422

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III. Intelligence Information for CVE-2026-7422

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Vendor Advisories for CVE-2026-7422 (2)

Vendor Pages for CVE-2026-7422 (2)

Same Patch Batch · AWS · 2026-04-29 · 5 CVEs total

CVE-2026-7424 8.1 HIGH Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP
CVE-2026-7426 8.1 HIGH Out-of-Bounds Write via Unsanitized Prefix Length in Router Advertisement Processing in Fr
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-290

V. Comments for CVE-2026-7422

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