Is CVE-2020-26421 in the CISA KEV catalog?

No. CVE-2020-26421 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-26421?

CVE-2020-26421 has a CVSS v3 base score of 4.2 (MEDIUM).

What is the EPSS score for CVE-2020-26421?

CVE-2020-26421 has an EPSS score of 2.59% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-26421?

Upgrade wireshark on debian 11 to 3.4.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2020-26421

MEDIUMEPSS 83th pctl

4.2

CVSS v3

NVD

Description

Crash in USB HID protocol dissector and possibly other dissectors in Wireshark 3.4.0 and 3.2.0 to 3.2.8 allows denial of service via packet injection or crafted capture file.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

wiresharkDebian

Fixed in:3.4.1-1CVE-2020-26421

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 ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

2.59%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Patch1

oracle.com

Exploit1

gitlab.com

Vendor Advisory1

wireshark.org

Third-Party Advisory3

Other references2

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	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.