PatchTheCVECVE-2021-38111: The DEF CON 27 badge allows remote attackers to exploit a buffer overflow by sending an oversized packet via t
CVE-2021-38111 is a high-severity flaw (CVSS 8.8) affecting def con 27 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- High severity
- Public exploit reference
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Adjacent network |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.3% (top 29%) |
| CISA exploited list | No |
| Weakness | CWE-120 |
| Published | 2021-08-04 |
| 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-2021-38111?
def con 27 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-38111 being exploited?
CVE-2021-38111 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-2021-38111 affect?
CVE-2021-38111 affects def con 27 firmware. Severity is high (CVSS 8.8). 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.
How urgent is CVE-2021-38111?
Priority 54/100. High severity; Public exploit reference