Is CVE-2021-3581 in the CISA KEV catalog?

No. CVE-2021-3581 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3581?

CVE-2021-3581 has a CVSS v3 base score of 7.0 (HIGH).

What is the EPSS score for CVE-2021-3581?

CVE-2021-3581 has an EPSS score of 0.34% (26th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3581?

Upgrade zephyr to 2.6.0 or later.

CVE & CISA-KEV Catalog

CVE-2021-3581

HIGH

7.0

CVSS v3

NVD

Description

Buffer Access with Incorrect Length Value in zephyr. Zephyr versions >= >=2.5.0 contain Buffer Access with Incorrect Length Value (CWE-805). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8q65-5gqf-fmw5

CWE-805 CWE-1284

How to fix

Remediation Available

zephyrNVD

Affected:>= 2.5.0, < 2.6.0Fixed in:2.6.0CVE-2021-3581derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 VectorPhysical

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.34%probability of exploitation in 30 days

26thpercentile

Low risk: more likely to be exploited than 26% of all known CVEs.

References

Patch1

github.com

Related Vulnerabilities

Other CWE-805 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-14509	Critical	9.8	2.0%	-	Fix
CVE-2025-23319	High	8.1	1.6%	-	Fix
CVE-2024-24851	High	7.5	1.4%	-	-
CVE-2021-31885	High	7.5	1.2%	-	Fix
CVE-2023-20049	High	8.6	1.0%	-	Fix
CVE-2020-16101	High	7.5	1.0%	-	Fix

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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.