Is CVE-2021-3966 in the CISA KEV catalog?

No. CVE-2021-3966 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3966?

CVE-2021-3966 has a CVSS v3 base score of 9.6 (CRITICAL).

What is the EPSS score for CVE-2021-3966?

CVE-2021-3966 has an EPSS score of 0.49% (38th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3966?

Upgrade zephyr to 3.0.0 or later.

CVE & CISA-KEV Catalog

CVE-2021-3966

CRITICAL

9.6

CVSS v3

NVD

Description

usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.

CWE-122Heap-based Buffer Overflow CWE-120Classic Buffer Overflow

How to fix

Remediation Available

zephyrNVD

Affected:< 3.0.0Fixed in:3.0.0CVE-2021-3966derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorAdjacent

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityLow

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H

Exploit Intelligence

0.49%probability of exploitation in 30 days

38thpercentile

Low risk: more likely to be exploited than 38% of all known CVEs.

References

Third-Party Advisory1

github.com

Related Vulnerabilities

Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2024-26256	High	7.8	88%	-	Fix
CVE-2020-25687	Medium	5.9	87%	-	Fix
CVE-2009-3459	High	8.8	86%	KEV	Fix
CVE-2021-21017	High	8.8	86%	KEV	-
CVE-2020-25683	Medium	5.9	86%	-	Fix

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Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.