CVE-2021-39920
CVSS v3
7.5
HIGH
EPSS Score
3.3 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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
Technical details
- Published
- 2021-11-18
Frequently asked questions
What is CVE-2021-39920?
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
Is CVE-2021-39920 actively exploited?
Active exploitation of CVE-2021-39920 has not been confirmed. Its EPSS score was 3.3% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-39920?
CVE-2021-39920 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2021-39920 affecting your environment?
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