CVE-2021-40154

Name: CVE-2021-40154
Creator: NVD / NIST
Published: 2021-12-01T15:15:07.603+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.73%

Last modified Jun 17, 2026

CVE-2021-40154 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. NXP LPC55S69 devices before A3 have a buffer over-read via a crafted wlength value in a GET Descriptor Configuration request during use of USB In-System Programming (ISP) mode. This discloses protected flash memory.. EPSS estimates a 0.73% chance of exploitation in the next 30 days.

Description

NXP LPC55S69 devices before A3 have a buffer over-read via a crafted wlength value in a GET Descriptor Configuration request during use of USB In-System Programming (ISP) mode. This discloses protected flash memory.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.73%

49.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Nxp	Lpc55s69jbd100 Firmware	All versions
Nxp	Lpc55s69jbd64 Firmware	All versions
Nxp	Lpc55s69jev98 Firmware	All versions

References

https://github.com/Xen1thLabs-AE/CVE-2021-40154Third Party Advisory
https://www.darkmatter.ae/xen1thlabs/published-advisories/Broken Link, Third Party Advisory
https://github.com/Xen1thLabs-AE/CVE-2021-40154Third Party Advisory
https://www.darkmatter.ae/xen1thlabs/published-advisories/Broken Link, Third Party Advisory

Timeline

Published: Dec 1, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40154?

How severe is CVE-2021-40154?

CVE-2021-40154 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.73% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40154?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-40154?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST