Integer overflow in Amazon Freertos-Plus-Tcp
CVE-2026-7424
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001
Affected products
- Amazon Freertos-Plus-Tcp
- AWS Freertos-Plus-Tcp — versions 4.0.0, 4.3.0, 4.2.6
Weakness classification (CWE)
References
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory, Vendor Advisory)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (patch, Release Notes)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (patch, Release Notes)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (third-party-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-7424?
- CVE-2026-7424 is a high-severity vulnerability in Amazon Freertos-Plus-Tcp, classified under Integer Underflow. CVSS score: 8.1/10. Published 2026-04-29.
- How severe is CVE-2026-7424?
- High severity. CVSS v3 base score is 8.1 out of 10.