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Fencer Vulns
medium 5.5

CVE-2021-4183 json

Crash in the pcapng file parser in Wireshark 3.6.0 allows denial of service via crafted capture file

published 2021-12-30 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-34043

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

Crash in the pcapng file parser in Wireshark 3.6.0 allows denial of service via crafted capture file

Patch / fix

  • wireshark Debian 14, Debian 13, Debian 12 3.6.2-1

debian advisories DEBIAN-CVE-2021-4183

  • wireshark SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +18 more 3.6.1-3.68.1
  • libvirt SLE Module for Server Applications 15 SP3, SLE Module for Basesystem 15 SP3, SLE Micro 5.1 7.1.0-150300.6.23.1

suse advisories SUSE-SU-2022:0375-1

  • wireshark openSUSE Tumbleweed 3.6.1-1.1
  • wireshark openSUSE Leap 15.3 3.6.1-3.68.1
  • libvirt openSUSE Leap 15.3 7.1.0-150300.6.23.1

opensuse advisories openSUSE-SU-2024:11703-1openSUSE-SU-2022:0375-1

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-2021-4183 updated cvss 5.5

wireshark: pcapng file parser 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

1.53% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.com https://gitlab.com/wireshark/wireshark/-/issues/17755 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/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.