CVE-2021-40154

lowpriority · track · 32EPSS 0.008 · 56 %ileexploit · PoCEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.77% (56th) EPSS

CVSS 2.1 · low

Is it mine?

4 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

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.

cvss

Technical severity, 0–10. One row per scoring source.

6.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.1–6.1

v2.02.1lowAV:L/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 2.9

v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 1.8 · impact 3.6

v3.16.1mediumCVSS:3.1/AC:L/AV:L/A:L/C:H/I:N/PR:L/S:U/UI:Nsecondary · ENISA EU

v3.16.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Lsecondary · cve@mitre.org USexploitability 1.8 · impact 4.2

v3.15.2mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USprimary

exploits (1)

Public proof-of-concept and weaponised exploit code.

Jeromeyoung/CVE-2021-40154POC to test the BootROM vulnerability found in LPC55S69 and K82 Series PoC · poc_in_github

affected products (4)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
nxp lpc55s69jbd100 firmwareall versionsnvdUScpe:2.3:o:nxp:lpc55s69jbd100_firmware:*:*:*:*:*:*:*:*
nxp lpc55s69jbd64 firmwareall versionsnvdUScpe:2.3:o:nxp:lpc55s69jbd64_firmware:*:*:*:*:*:*:*:*
nxp lpc55s69jev98 firmwareall versionsnvdUScpe:2.3:o:nxp:lpc55s69jev98_firmware:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-12-01modified 2026-06-17

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+11877 more

references (8)

External citations — patches, advisories, analysis.

scry

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