Infinite loop in Wireshark
Priority MEDIUM 40CWE-835Published · 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
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-835.
Summary
Infinite loop in the BitTorrent DHT dissector in Wireshark 3.6.0 and 3.4.0 to 3.4.10 allows denial of service via packet injection or crafted capture file
Why it matters now
EPSS 0.04056 90th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Wireshark (Wireshark Foundation): 3.4.10Red Hat: 1 without a fix
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 | =3.6.0; 3.4.0 to before 3.4.10 | 3.4.10 | Patch available | CNA |
- Wireshark VendorWireshark Foundation Affected =3.6.0; 3.4.0 to before 3.4.10 Fixed in 3.4.10 Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* | 3.4.0 – 3.4.10 | Vulnerable | Wireshark Foundation |
| cpe:2.3:a:wireshark:wireshark:3.6.0:*:*:*:*:*:*:* | 3.6.0 | 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:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:* | 12.2.1.3.0 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:* | 12.2.1.4.0 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:* | 8.8 | Vulnerable | Oracle |
- cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* Versions 3.4.0 – 3.4.10 Vulnerable ·Wireshark Foundation
- cpe:2.3:a:wireshark:wireshark:3.6.0:*:*:*:*:*:*:* Versions 3.6.0 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
- cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:* Versions 12.2.1.3.0 Vulnerable ·Oracle
- cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:* Versions 12.2.1.4.0 Vulnerable ·Oracle
- cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:* Versions 8.8 Vulnerable ·Oracle
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-2022-30411cb3c4
7 records Highest priority Priority MEDIUM 3 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2021-03052 Infinite loop in WiresharkPriority MEDIUM 40
- TI-2021-03048 Out-of-bounds read in WiresharkPriority MEDIUM 40
- TI-2021-03057 Large loop in the Kafka dissector in Wireshark 3.6.0 allows denial of service via packet…Priority LOW 39
- Advisory ·
Wireshark — FEDORA-2022-1daf93c51d
7 records Highest priority Priority MEDIUM 3 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2021-03052 Infinite loop in WiresharkPriority MEDIUM 40
- TI-2021-03048 Out-of-bounds read in WiresharkPriority MEDIUM 40
- TI-2021-03057 Large loop in the Kafka dissector in Wireshark 3.6.0 allows denial of service via packet…Priority LOW 39
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 9 | Affected | No fix planned: Will not fix |
Not affected: 3 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2021-4184
- 2026-10-03 Alias added: GHSA-g3fh-c7h3-x56j
- 2026-10-23 EPSS moved to the 90th–95th percentile
- 2026-10-23 Priority changed: LOW → MEDIUM
References
Advisory 7
- https://www.wireshark.org/security/wnpa-sec-2021-18.html
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4184.json
- FEDORA-2022-1daf93c51d
- FEDORA-2022-30411cb3c4
- [debian-lts-announce] 20220331 [SECURITY] [DLA 2967-1] wireshark security update
- https://www.oracle.com/security-alerts/cpuapr2022.html
- GLSA-202210-04
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-2021-4184 · CVE Program
- CVE-2021-4184 · NVD
- FIRST EPSS
- GHSA-g3fh-c7h3-x56j · GitHub Advisory Database · CC BY 4.0
- CVE-2021-4184 · Red Hat security data · CC BY 4.0
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