Is CVE-2021-39920 in the CISA KEV catalog?

No. CVE-2021-39920 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-39920?

CVE-2021-39920 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-39920?

CVE-2021-39920 has an EPSS score of 3.16% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-39920?

Upgrade wireshark on debian 11 to 3.4.10-0+deb11u1 or later.

CVE & CISA-KEV Catalog

CVE-2021-39920

HIGHEPSS 86th pctl

7.5

CVSS v3

NVD

Description

NULL pointer exception in the IPPUSB dissector in Wireshark 3.4.0 to 3.4.9 allows denial of service via packet injection or crafted capture file

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

wiresharkDebian

Fixed in:3.4.10-0+deb11u1CVE-2021-39920

Fixed in:3.6.0-1CVE-2021-39920

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

3.16%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Exploit1

gitlab.com

Vendor Advisory1

wireshark.org

Third-Party Advisory3

Other references2

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	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.