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No exploitation reportedFix available

CVE-2021-39926

No exploitation reported by the sources we read.

  • Published2021-11-19
  • WeaknessCWE-120

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Buffer overflow in the Bluetooth HCI_ISO dissector in Wireshark 3.4.0 to 3.4.9 allows denial of service via packet injection or crafted capture file

Timeline

dates in UTC
  1. 2021-11-1917:15CVE publishedNVD

Versions per branch

NVD
Wireshark
BranchAffectedFixed in
3.4≥ 3.4.0, ≤ 3.4.9no fix published
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published
11.0= 11.0no fix published
Fedoraproject fedora
BranchAffectedFixed in
34.x= 34no fix published
35.x= 35no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • wiresharkUbuntu:Pro:22.04:LTSall versions · no fixed version listed
  • wiresharkUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • wiresharkUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • wiresharkUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • wiresharkUbuntu:Pro:14.04:LTSall versions · no fixed version listed
  • wiresharkSUSE:Linux Enterprise Module for Desktop Applications 15 SP3all versions · fixed in 3.4.10-3.62.1
  • wiresharkSUSE:Linux Enterprise Module for Desktop Applications 15 SP2all versions · fixed in 3.4.10-3.62.1
  • wiresharkSUSE:Linux Enterprise Module for Basesystem 15 SP3all versions · fixed in 3.4.10-3.62.1

21 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-39926 Red Hat Product Security

    wireshark: bluetooth HCI_ISO dissector crash

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.17.5known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • NVDweakness (CWE)CWE-120read 2026-10-23
  • FIRST EPSSEPSS score8.0 %2026-11-09
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-11-19
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-g42c-hpcx-483f

Frequently asked questions

What is CVE-2021-39926?

Buffer overflow in the Bluetooth HCI_ISO dissector in Wireshark 3.4.0 to 3.4.9 allows denial of service via packet injection or crafted capture file

Is CVE-2021-39926 actively exploited?

Active exploitation of CVE-2021-39926 has not been confirmed. Its EPSS score was 8.0% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-39926?

CVE-2021-39926 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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