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TI-2021-17156 Aliases CVE-2021-39926GHSA-g42c-hpcx-483f

Buffer overflow in Wireshark

Priority MEDIUM 44CWE-120Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.

Summary

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

Why it matters now

EPSS 0.07957 94th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Wireshark (Wireshark Foundation): 3.4.10

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Wireshark FoundationWireshark3.4.0 to before 3.4.103.4.10Patch availableCNA
  • Wireshark VendorWireshark Foundation Affected 3.4.0 to before 3.4.10 Fixed in 3.4.10 Patch available CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:*3.4.0 – 3.4.9VulnerableWireshark Foundation
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*34VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*35VulnerableFedoraproject
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
  • cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* Versions 3.4.0 – 3.4.9 Vulnerable ·Wireshark Foundation
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian

Remediation

  • Fix · CNA Wireshark (Wireshark Foundation) Fixed in 3.4.10

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Wireshark — FEDORA-2021-3747cf6107

    8 records Highest priority Priority MEDIUM 5 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2021-17155 Buffer overflow in WiresharkPriority MEDIUM 44
    • TI-2021-17158 NULL pointer dereference in WiresharkPriority MEDIUM 42
    • TI-2021-17154 Large loop in the Bluetooth DHT dissector in Wireshark 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17…Priority MEDIUM 41
    Show all 8 records → Advisory →
  • Advisory ·

    Wireshark — FEDORA-2021-97bd631e0a

    8 records Highest priority Priority MEDIUM 5 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2021-17155 Buffer overflow in WiresharkPriority MEDIUM 44
    • TI-2021-17158 NULL pointer dereference in WiresharkPriority MEDIUM 42
    • TI-2021-17154 Large loop in the Bluetooth DHT dissector in Wireshark 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17…Priority MEDIUM 41
    Show all 8 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-39926
  2. 2026-10-03 Alias added: GHSA-g42c-hpcx-483f

References

Exploit 1

Advisory 6

  • TI-2026-53718 Heap-based Buffer Overflow in Wireshark CVSS 3.1CRITICAL 9.8
  • TI-2026-63612 Heap-based Buffer Overflow in Wireshark CVSS 3.1HIGH 8.8
  • TI-2024-16149 A buffer overflow in Wireshark before 4.2.0 allows a remote attacker to cause a denial of… CVSS 3.1HIGH 7.5
  • TI-2010-00291 Multiple buffer overflows in the LWRES dissector in Wireshark 0.9.15 through 1.0.10 and… CVSS 2.0HIGH 7.5
  • TI-2026-63614 Heap-based Buffer Overflow in Wireshark CVSS 3.1HIGH 8.1
  • TI-2014-01823 Buffer overflow in the mpeg_read function in wiretap/mpeg.c in the MPEG parser in… CVSS 2.0HIGH 9.3
See all 794 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences