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 SDP 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
Why it matters now
EPSS 0.08139 94th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Wireshark (Wireshark Foundation): 3.4.10, 3.2.18
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Wireshark Foundation | Wireshark | 3.4.0 to before 3.4.10; 3.2.0 to before 3.2.18 | 3.4.10, 3.2.18 | Patch available | CNA |
- Wireshark VendorWireshark Foundation Affected 3.4.0 to before 3.4.10; 3.2.0 to before 3.2.18 Fixed in 3.4.10, 3.2.18 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* | 3.2.0 – 3.2.17; 3.4.0 – 3.4.9 | Vulnerable | Wireshark Foundation |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* | 35 | Vulnerable | Fedoraproject |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
- cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* Versions 3.2.0 – 3.2.17; 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:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
Remediation
- Fix · CNA Wireshark (Wireshark Foundation) Fixed in 3.4.10, 3.2.18
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-2021-17156 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
- Advisory ·
Wireshark — FEDORA-2021-97bd631e0a
8 records Highest priority Priority MEDIUM 5 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2021-17156 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
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
- 2026-10-02 Threatist record created from CVE-2021-39925
- 2026-10-03 Alias added: GHSA-cqr2-f5xh-xf23
References
More Wireshark Foundation Wireshark vulnerabilities
- 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
Sources
- CVE-2021-39925 · CVE Program
- CVE-2021-39925 · NVD
- FIRST EPSS
- GHSA-cqr2-f5xh-xf23 · GitHub Advisory Database · CC BY 4.0
- CVE-2021-39925 · Red Hat security data · CC BY 4.0
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