How severe is CVE-2021-38111?

CVE-2021-38111 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-38111 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38111?

CVE-2021-38111 affects Defcon Def Con 27 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-38111?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-38111 published?

CVE-2021-38111 was published on 2021-08-04 and last updated on 2026-06-17.

CVE-2021-38111

CVE-2021-38111 is a high-severity vulnerability in Defcon Def Con 27 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 5.8
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Defcon Def Con 27 Firmware
Published: 2021-08-04
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-38111?: CVE-2021-38111 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-38111 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38111?: CVE-2021-38111 affects Defcon Def Con 27 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-38111?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-38111 published?: CVE-2021-38111 was published on 2021-08-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:defcon:def_con_27_firmware:-:*:*:*:*:*:*:*

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