Cyber Resilience

CVE-2021-38111

HighPublic PoC

Published: 04 August 2021

Published
04 August 2021
Modified
05 May 2025
KEV Added
—
Patch
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CVSS Score v3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0039 60.7th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-38111 is a high-severity Classic Buffer Overflow (CWE-120) vulnerability in Defcon Def Con 27 Firmware. Its CVSS base score is 8.8 (High).

Operationally, ranked in the top 39.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

The DEF CON 27 badge allows remote attackers to exploit a buffer overflow by sending an oversized packet via the NFMI (Near Field Magnetic Induction) protocol.

CWE(s)
CWE-120

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

defcon
def con 27 firmware
all versions

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-120

Platform-independent managed code eliminates the need for unchecked native buffer copies that are the root cause of classic buffer overflows.

References