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Vulnerability · Published Nov 18, 2021 · Assigned by GitLab

CVE-2021-39920

High 7.5

In plain English

A high-severity security flaw in Wireshark from Wireshark Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.3% (higher than 89% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)3.3%top 11.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20wireshark3.4.11-r0ALPINE-CVE-2021-39920
Alpine:v3.21wireshark3.4.11-r0ALPINE-CVE-2021-39920
Alpine:v3.22wireshark3.4.11-r0ALPINE-CVE-2021-39920
Alpine:v3.23wireshark3.4.11-r0ALPINE-CVE-2021-39920
Alpine:v3.24wireshark3.4.11-r0ALPINE-CVE-2021-39920
Debian:12wireshark3.6.0-1DEBIAN-CVE-2021-39920
Debian:13wireshark3.6.0-1DEBIAN-CVE-2021-39920
Debian:14wireshark3.6.0-1DEBIAN-CVE-2021-39920
Ubuntu:24.04:LTSwiresharkno fix listedUBUNTU-CVE-2021-39920
Ubuntu:25.10wiresharkno fix listedUBUNTU-CVE-2021-39920
Ubuntu:26.04:LTSwiresharkno fix listedUBUNTU-CVE-2021-39920
Ubuntu:26.10wiresharkno fix listedUBUNTU-CVE-2021-39920

Affected products (as reported)

VendorProductVersions
Wireshark Foundation Wireshark >=3.4.0, <3.4.10

References