CVE-2026-7424

High

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.

SeverityHigh

CVSS8.1

Exploit probability—

ProductAmazon Freertos-plus-tcp

PublishedApr 29, 2026

First seenApr 29, 2026

Weakness typeCWE-191CWE-191

How to fix

Update

amazon freertos-plus-tcp4.2.6, 4.4.1 or later

Patches

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-022-aws/

Affected products

Product	Affected versions	Fixed in
amazon freertos-plus-tcp	4.0.0 ≤ v < 4.2.6, 4.3.0 ≤ v < 4.4.1	4.2.6, 4.4.1

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.