MEDIUM
CVE-2021-40154
CWE-125Published: December 1, 2021· Updated: Jun 17, 2026
5.5
CVSS v3.1
Official 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.
Technical Analysis
CVE-2021-40154 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected Vendors & Products
nxp6 product(s)
lpc55s69jbd100 firmwarelpc55s69jbd100lpc55s69jbd64 firmwarelpc55s69jbd64lpc55s69jev98 firmwarelpc55s69jev98
Source: NVD CPE · 9 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (4)
→
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
Quick Facts
CVE IDCVE-2021-40154
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-125
CISA KEVNo
Affected1 vendor(s)
PublishedDec 1, 2021
Related CVEs (CWE-125)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-40154 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.