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    CVE-2026-7422

    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.

    Published:Apr 29, 2026
    Last Modified:May 4, 2026
    EPS:Apr 29, 2026
    EPSS Score:0.00016
    CVSS Score:6.5

    Affected Products

    Vendor
    Amazon
    Product
    Freertos-plus-tcp

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-7426 (CVSS 6.1) — Insufficient validation of the prefix length field in IPv6 Router Advertisement processing in FreeRTOS-Plus-TC…
    CVE-2026-7425 (CVSS 6) — Insufficient option length validation in the IPv6 Router Advertisement parser in FreeRTOS-Plus-TCP before V4.2…
    CVE-2026-7424 (CVSS 7.2) — Integer underflow in the DHCPv6 sub-option parser in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adja…
    CVE-2026-7423 (CVSS 6) — Integer underflow in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 all…
    CVE-2025-11618 (CVSS 5.3) — A missing validation check in FreeRTOS-Plus-TCP's UDP/IPv6 packet processing code can lead to an invalid point…
    CVE-2025-11617 (CVSS 5.3) — A missing validation check in FreeRTOS-Plus-TCP's IPv6 packet processing code can lead to an out-of-bounds rea…
    CVE-2025-11616 (CVSS 5.3) — A missing validation check in FreeRTOS-Plus-TCP's ICMPv6 packet processing code can lead to an out-of-bounds r…
    CVE-2024-38373 (CVSS 9.6) — FreeRTOS-Plus-TCP is a lightweight TCP/IP stack for FreeRTOS. FreeRTOS-Plus-TCP versions 4.0.0 through 4.1.0 c…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High