CVE•Published 2026-04-29•Modified 2026-05-04•1 article on news•5 live references•NVD data

CVE-2026-7424Amazon · Freertos-plus-tcp

Vulnerability data via NVD (ingested)

CVSS v3.1

8.1

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

EPSS percentile

Exploit Prediction Scoring System · top 98% of all CVEs

Weaknesses (CWE)

CWE-191Integer Underflow (Wrap or Wraparound)

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.

Timeline

Published 2026-04-29

Modified 2026-05-04

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-7424

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Amazon Freertos-plus-tcp"

All exposed Amazon Freertos-plus-tcp instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Freertos-plus-tcp"

HTTP body or banner mentions "Freertos-plus-tcp" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-7424