Is CVE-2021-3321 in the CISA KEV catalog?

No. CVE-2021-3321 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3321?

CVE-2021-3321 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-3321?

CVE-2021-3321 has an EPSS score of 0.74% (50th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3321?

Upgrade zephyr to 2.5.0 or later.

CVE & CISA-KEV Catalog

CVE-2021-3321

HIGH

7.5

CVSS v3

NVD

Description

Integer Underflow in Zephyr in IEEE 802154 Fragment Reassembly Header Removal. Zephyr versions >= >=2.4.0 contain Integer Overflow to Buffer Overflow (CWE-680). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-w44j-66g7-xw99

CWE-680 CWE-191

How to fix

Remediation Available

zephyrNVD

Affected:>= 2.4.0, < 2.5.0Fixed in:2.5.0CVE-2021-3321derived 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 VectorAdjacent

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityHigh

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

Exploit Intelligence

0.74%probability of exploitation in 30 days

50thpercentile

Moderate risk: more likely to be exploited than 50% of all known CVEs.

References

Patch1

github.com

Related Vulnerabilities

Other CWE-680 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-24834	High	7.0	41%	-	Fix
CVE-2021-32761	High	7.5	31%	-	Fix
CVE-2020-6116	High	7.8	28%	-	-
CVE-2021-40417	Critical	9.8	16%	-	-
CVE-2021-32628	High	7.5	13%	-	Fix
CVE-2018-8787	Critical	9.8	8.4%	-	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.