CVE-2021-40154
NXP LPC55S69 devices before A3 have a buffer over-read via a crafted wlength value in a GET...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2021-40154- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AC:L/AV:L/A:L/C:H/I:N/PR:L/S:U/UI:N - Updated
- 2026-11-02
EUVDEUVD-2021-27339
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.
- Record
EUVD-2021-27339- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AC:L/AV:L/A:L/C:H/I:N/PR:L/S:U/UI:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-f88h-2xxc-h4r4 No score
NXP LPC55S69 devices before A3 have a buffer over-read via a crafted wlength value in a GET...
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.
- Record
GHSA-f88h-2xxc-h4r4- Weakness
- CWE-125
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-40154- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L - CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 2.1 Low
AV:L/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-125
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | Jeromeyoung/CVE-2021-40154 | 2021-11-24 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-40154 is a medium vulnerability (CVSS 6.1) in Nxp Lpc55s69jbd100 Firmware, published December 1, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.77%, the 55th percentile. No source names a fixed version.