PatchTheCVECVE-2021-40154: NXP LPC55S69 devices before A3 have a buffer over-read via a crafted wlength value in a GET Descriptor Configu
CVE-2021-40154 is a medium-severity flaw (CVSS 6.1) affecting lpc55s69jbd100 firmware, lpc55s69jbd64 firmware, lpc55s69jev98 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- No elevated risk signals yet
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 6.1 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.8% (top 44%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2021-12-01 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-40154?
lpc55s69jbd100 firmware: mitigate or apply the listed mitigation; lpc55s69jbd64 firmware: mitigate or apply the listed mitigation; lpc55s69jev98 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-40154 being exploited?
CVE-2021-40154 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-40154 affect?
CVE-2021-40154 affects lpc55s69jbd100 firmware, lpc55s69jbd64 firmware, lpc55s69jev98 firmware. Severity is medium (CVSS 6.1). 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.
How urgent is CVE-2021-40154?
Priority 35/100. No elevated risk signals yet.
Related CVEs
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