Skip to content
Fencer Vulns
high 7.5

CVE-2021-39928 json

NULL pointer exception in the IEEE 802.11 dissector in Wireshark 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17 allows denial of service via packet inj…

published 2021-11-18 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26284

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.9%
EPSS 5.9% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

NULL pointer exception in the IEEE 802.11 dissector in Wireshark 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17 allows denial of service via packet injection or crafted capture file

Patch / fix

  • wireshark wireshark 3.2.18, 3.4.10
  • wireshark Debian 14, Debian 13, Debian 12 3.6.0-1

debian advisories DEBIAN-CVE-2021-39928

  • wireshark SLE Module for Desktop Applications 15 SP3, SLE Module for Desktop Applications 15 SP2, SLE Module for Basesystem 15 SP3 +1 more 3.4.10-3.62.1

suse advisories SUSE-SU-2021:3938-1

  • wireshark openSUSE Tumbleweed 3.4.10-1.1
  • wireshark openSUSE Leap 15.2 3.4.10-lp152.2.21.1
  • wireshark openSUSE Leap 15.3 3.4.10-3.62.1

opensuse advisories openSUSE-SU-2024:11641-1openSUSE-SU-2021:1566-1openSUSE-SU-2021:3938-1

  • wireshark Alpine 3.15 3.4.13-r0
  • wireshark Alpine 3.24, Alpine 3.23, Alpine 3.22 +6 more 3.4.11-r0

alpine advisories ALPINE-CVE-2021-39928

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • wireshark CBL-Mariner 2.0 3.4.14-1

azure linux advisories AZL-7415

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • wireshark-cli Arch Linux 3.4.10-1

arch linux advisories AVG-2564

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-39928 updated cvss 7.5

wireshark: IEEE 802.11 dissector crash

  • Red Hat Enterprise Linux 6 wireshark, wireshark-gnome Red Hat Enterprise Linux 7 wireshark, wireshark-gnome Red Hat Enterprise Linux 8 wireshark, wireshark-cli Red Hat Enterprise Linux 9 wireshark, wireshark-cli
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

5.91% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.com https://gitlab.com/wireshark/wireshark/-/issues/17704 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • Wireshark Foundation Wireshark

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.