What is CVE-2021-38111?

CVE-2021-38111 is a high-severity vulnerability in Defcon Def Con 27, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2021-08-04.

How severe is CVE-2021-38111?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2021-38111 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Defcon Def Con 27

CVE-2021-38111

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.

Vulnerability class: Buffer Overflow

Published 2021-08-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (70.0th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

References

defcon.org/html/defcon-29/dc-29-speakers.html (Exploit, Third Party Advisory)
github.com/skintigh/defcon27_badge_sdr

Frequently asked questions

What is CVE-2021-38111?: CVE-2021-38111 is a high-severity vulnerability in Defcon Def Con 27, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2021-08-04.
How severe is CVE-2021-38111?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2021-38111 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.