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Fencer Intel
medium 4.2

CVE-2020-26421 json

Crash in USB HID protocol dissector and possibly other dissectors in Wireshark 3.4.0 and 3.2.0 to 3.2.8 allows denial of service via packet…

published 5y ago modified 4mo ago also EUVD-2020-18968

cvss
4.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

Crash in USB HID protocol dissector and possibly other dissectors in Wireshark 3.4.0 and 3.2.0 to 3.2.8 allows denial of service via packet injection or crafted capture file.

Patch / fix

  • wireshark Debian 14, Debian 13, Debian 12 3.4.1-1

debian advisories DEBIAN-CVE-2020-26421

  • wireshark SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 2.4.16-48.57.1
  • wireshark SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +14 more 3.4.5-3.53.1
  • sbc SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +14 more 1.3-3.2.1
  • libvirt SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.0.0-9.37.21
  • libqt5-qtmultimedia SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +6 more 5.9.7-7.2.1

suse advisories SUSE-SU-2024:3323-1SUSE-SU-2021:2125-1

  • wireshark openSUSE Tumbleweed 3.4.8-1.2
  • wireshark openSUSE Leap 15.3 3.4.5-3.53.1
  • sbc openSUSE Leap 15.3 1.3-3.2.1
  • wireshark openSUSE Leap 15.2 3.4.5-lp152.2.12.1

opensuse advisories openSUSE-SU-2024:11513-1openSUSE-SU-2021:2125-1openSUSE-SU-2021:0909-1

  • wireshark Alpine 3.12 3.2.9-r0
  • wireshark Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 3.4.1-r0

alpine advisories ALPINE-CVE-2020-26421

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-cli Arch Linux 3.4.1-1

arch linux advisories AVG-1352

Is CVE-2020-26421 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2020-26421 updated cvss 5.9

wireshark: USB HID dissector crash (wnpa-sec-2020-17)

  • Red Hat Enterprise Linux 6 wireshark, wireshark-gnome Red Hat Enterprise Linux 7 wireshark, wireshark-gnome
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 wireshark, wireshark-cli
    affected: no fix available “Fix deferred”
  • 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

2.55% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • gitlab.com https://gitlab.com/wireshark/wireshark/-/issues/16958 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.2 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • The Wireshark Foundation Wireshark

Classification

Weakness

References

Sources

Fencer Intel 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.