Is CVE-2021-39920 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 3%.

What products does CVE-2021-39920 affect?

Tracked products affected include Wireshark. Check the version you run to see whether it is affected.

How do I fix CVE-2021-39920?

Apply the vendor fix promptly. Upgrade affected products to a fixed version.

CVE-2021-39920

Q: What is CVE-2021-39920?

CVE-2021-39920 is a high-severity software vulnerability (CWE-476) with a CVSS score of 7.5. 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

HIGH severity · CVSS 7.5 · CWE-476

7.5CVSS HIGH

Summary

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

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)3%

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

Affected products we track (1)

Wireshark

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Additional information

NVD record
https://www.wireshark.org/security/wnpa-sec-2021-15.htmlAdvisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39920.jsonAdvisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A6AJFIYIHS3TYDD2EBYBJ5KKE52X34BJ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YEWTIRMC2MFQBZ2O5M4CJHJM4JPBHLXH/
https://security.gentoo.org/glsa/202210-04Advisory
https://www.debian.org/security/2021/dsa-5019Advisory
https://gitlab.com/wireshark/wireshark/-/issues/17705Advisory