What is CVE-2018-16601?

CVE-2018-16601 is a high-severity vulnerability in Amazon Web Services Freertos, classified under Integer Underflow. CVSS score: 8.1/10. Published 2018-12-06.

How severe is CVE-2018-16601?

High severity. CVSS v3 base score is 8.1 out of 10.

Integer overflow in Amazon Web Services Freertos

CVE-2018-16601

An issue was discovered in Amazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up to V10.0.1 (with FreeRTOS+TCP), and WITTENSTEIN WHIS Connect middleware TCP/IP component. A crafted IP header triggers a full memory space copy in prvProcessIPPacket, leading to denial of service and possibly remote code execution.

Published 2018-12-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.042 (90.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.042 · newest: 0.042 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

github.com/aws/amazon-freertos/blob/v1.3.2/CHANGELOG.md (Third Party Advisory, Release Notes)
blog.zimperium.com/freertos-tcpip-stack-vulnerabilities-details/ (Exploit, Third Party Advisory)
blog.zimperium.com/freertos-tcpip-stack-vulnerabilities-put-wide-range-devices-… (Third Party Advisory)

Frequently asked questions

What is CVE-2018-16601?: CVE-2018-16601 is a high-severity vulnerability in Amazon Web Services Freertos, classified under Integer Underflow. CVSS score: 8.1/10. Published 2018-12-06.
How severe is CVE-2018-16601?: High severity. CVSS v3 base score is 8.1 out of 10.