CVE-2021-22235

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service...

7.5 HighFix available

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service via packet injection or crafted capture file

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

3.43%Up 2.4 points since Jul 21, 2021

What each source reports

CVE List Score used 7.5

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service via packet injection or crafted capture file

Record: CVE-2021-22235
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

EUVDEUVD-2021-9381 7.5

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service via packet injection or crafted capture file

Record: EUVD-2021-9381
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-c9h4-m6h9-v7wx 7.5

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service...

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service via packet injection or crafted capture file

Record: GHSA-c9h4-m6h9-v7wx
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-835
Updated: 2026-11-02

NVD 7.5

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service via packet injection or crafted capture file

Record: CVE-2021-22235
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-835
Updated: 2026-11-02

OSVALPINE-CVE-2021-22235 7.5

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service via packet injection or crafted capture file

Record: ALPINE-CVE-2021-22235
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-03

OSVAZL-7407 7.5

CVE-2021-22235 affecting package wireshark for versions less than 3.4.14-1

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service via packet injection or crafted capture file

Record: AZL-7407
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

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OSV 7.5

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service via packet injection or crafted capture file

Record: CVE-2021-22235
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-22235 7.5

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service via packet injection or crafted capture file

Record: DEBIAN-CVE-2021-22235
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-22235 7.5

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service via packet injection or crafted capture file

Record: UBUNTU-CVE-2021-22235
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVMGASA-2021-0364 No score

Updated wireshark packages fix a security vulnerability

Crash in DNP dissector in Wireshark 3.4.0 to 3.4.6 and 3.2.0 to 3.2.14 allows denial of service via packet injection or crafted capture file (CVE-2021-22235).

Record: MGASA-2021-0364
Updated: 2026-11-02

OSVopenSUSE-SU-2021:1276-1 No score

Security update for wireshark

This update for wireshark fixes the following issues:

Update to Wireshark 3.4.7
CVE-2021-22235: Fixed DNP dissector crash (bsc#1188375).

This update was imported from the SUSE:SLE-15:Update update project.

Record: openSUSE-SU-2021:1276-1
Updated: 2026-11-02

OSVopenSUSE-SU-2021:3017-1 No score

Security update for wireshark

This update for wireshark fixes the following issues:

Update to Wireshark 3.4.7
CVE-2021-22235: Fixed DNP dissector crash (bsc#1188375).

Record: openSUSE-SU-2021:3017-1
Updated: 2026-11-02

OSVopenSUSE-SU-2024:11513-1 No score

libwireshark14-3.4.8-1.2 on GA media

These are all security issues fixed in the libwireshark14-3.4.8-1.2 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:11513-1
Updated: 2026-11-02

OSVSUSE-SU-2021:3017-1 No score

Security update for wireshark

This update for wireshark fixes the following issues:

Update to Wireshark 3.4.7
CVE-2021-22235: Fixed DNP dissector crash (bsc#1188375).

Record: SUSE-SU-2021:3017-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`wireshark` Alpine:v3.14	3.2.0 up to 3.4.7-r0	3.4.7-r0
`wireshark` Alpine:v3.15	3.2.0 up to 3.4.7-r0	3.4.7-r0
`wireshark` Alpine:v3.16	3.2.0 up to 3.4.7-r0	3.4.7-r0
`wireshark` Alpine:v3.17	3.2.0 up to 3.4.7-r0	3.4.7-r0
`wireshark` Alpine:v3.18	3.2.0 up to 3.4.7-r0	3.4.7-r0
`wireshark` Alpine:v3.19	3.2.0 up to 3.4.7-r0	3.4.7-r0
`wireshark` Alpine:v3.20	3.2.0 up to 3.4.7-r0	3.4.7-r0
`wireshark` Alpine:v3.21	3.2.0 up to 3.4.7-r0	3.4.7-r0
`wireshark` Alpine:v3.22	3.2.0 up to 3.4.7-r0	3.4.7-r0
`wireshark` Alpine:v3.23	3.2.0 up to 3.4.7-r0	3.4.7-r0

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Affected packages
Package	Affected	Fixed
`wireshark` Alpine:v3.24	3.2.0 up to 3.4.7-r0	3.4.7-r0
`wireshark` Azure Linux:2	before 3.4.14-1	3.4.14-1
`wireshark` Debian:12	before 3.4.7-1	3.4.7-1
`wireshark` Debian:13	before 3.4.7-1	3.4.7-1
`wireshark` Debian:14	before 3.4.7-1	3.4.7-1
`wireshark` Debian:9 From an advisory covering 9 CVEs	before 2.6.20-0+deb9u2, plus listed versions 2.2.6+g32dac6a-22.2.6+g32dac6a-2+deb9u12.2.6+g32dac6a-2+deb9u22.2.6+g32dac6a-2+deb9u32.2.7-1 Show 25 moreShow less 2.4.0-12.4.1-12.4.2-12.4.3-12.4.4-12.4.5-12.4.6-12.6.1-12.6.10-12.6.2-12.6.2-22.6.20-0+deb9u12.6.3-12.6.3-1~deb9u12.6.4-12.6.4-22.6.5-12.6.5-1~deb9u12.6.6-12.6.7-12.6.7-1~deb9u12.6.8-12.6.8-1.12.6.8-1.1~deb9u12.6.9-1	2.6.20-0+deb9u2
`wireshark` Debian:11 From an advisory covering 12 CVEs	before 3.4.10-0+deb11u1, plus listed versions 3.4.4-13.4.6-1~exp13.4.7-13.4.7-1~exp13.4.8-13.4.9-1	3.4.10-0+deb11u1
`wireshark` Mageia:8	before 3.4.7-1.mga8	3.4.7-1.mga8
`wireshark` SUSE:Linux Enterprise Module for Basesystem 15 SP2	before 3.4.7-3.59.1	3.4.7-3.59.1
`wireshark` SUSE:Linux Enterprise Module for Basesystem 15 SP3	before 3.4.7-3.59.1	3.4.7-3.59.1
`wireshark` SUSE:Linux Enterprise Module for Desktop Applications 15 SP2	before 3.4.7-3.59.1	3.4.7-3.59.1
`wireshark` SUSE:Linux Enterprise Module for Desktop Applications 15 SP3	before 3.4.7-3.59.1	3.4.7-3.59.1
`wireshark` Ubuntu:Pro:14.04:LTS	All versions, plus listed versions 1.10.2-11.10.3-11.10.5-1ubuntu11.10.5-21.10.6-1 Show 9 moreShow less 1.12.1+g01b65bf-4+deb8u11ubuntu0.14.04.12.6.3-1~ubuntu14.04.12.6.4-2~ubuntu14.04.12.6.5-1~ubuntu14.04.12.6.6-1~ubuntu14.04.02.6.8-1~ubuntu14.04.0~esm12.6.10-1~ubuntu14.04.0~esm12.6.10-1~ubuntu14.04.0~esm22.6.10-1~ubuntu14.04.0~esm3	None known
`wireshark` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 1.12.7+g7fc8978-11.12.8+g5b6e543-22.0.1+g59ea380-3build12.0.2+ga16e22e-12.2.6+g32dac6a-2ubuntu0.16.04 Show 8 moreShow less 2.6.3-1~ubuntu16.04.12.6.4-2~ubuntu16.04.02.6.5-1~ubuntu16.04.02.6.6-1~ubuntu16.04.02.6.8-1~ubuntu16.04.02.6.10-1~ubuntu16.04.02.6.10-1~ubuntu16.04.0+esm12.6.10-1~ubuntu16.04.0+esm2	None known
`wireshark` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 2.4.2-12.4.3-12.4.4-12.4.5-12.6.3-1~ubuntu18.04.1 Show 7 moreShow less 2.6.4-2~ubuntu18.04.02.6.5-1~ubuntu18.04.02.6.6-1~ubuntu18.04.02.6.8-1~ubuntu18.04.02.6.10-1~ubuntu18.04.02.6.10-1~ubuntu18.04.0+esm12.6.10-1~ubuntu18.04.0+esm2	None known
`wireshark` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 3.0.5-13.0.7-13.2.1-13.2.2-13.2.3-13.2.3-1ubuntu0.1~esm13.2.3-1ubuntu0.1~esm2	None known
`wireshark` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 3.4.7-1~exp13.4.9-13.6.2-1ubuntu13.6.2-23.6.2-2ubuntu0.1~esm1	None known
`wireshark` Ubuntu:24.04:LTS	All versions, plus listed versions 4.0.8-14.0.10-14.0.11-14.2.0-14.2.2-14.2.2-1.1build14.2.2-1.1build24.2.2-1.1build3	None known
`wireshark` Ubuntu:25.10	All versions, plus listed versions 4.4.5-14.4.6-24.4.6-2build14.4.7-1	None known
`wireshark` Ubuntu:26.10	All versions, plus listed versions 4.6.4-14.6.6-14.6.6-24.6.6-2build1	None known
`wireshark` Ubuntu:26.04:LTS	All versions, plus listed versions 4.4.7-14.6.0-14.6.1-24.6.2-34.6.3-14.6.4-1	None known
`wireshark` openSUSE:Leap 15.2	before 3.4.7-lp152.2.18.1	3.4.7-lp152.2.18.1
`wireshark` openSUSE:Leap 15.3	before 3.4.7-3.59.1	3.4.7-3.59.1
`wireshark` openSUSE:Tumbleweed From an advisory covering 163 CVEs	before 3.4.8-1.2	3.4.8-1.2

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	affected, aliases, references	OSV
Nov 3, 2026	aliases, products	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-22235 is a high vulnerability (CVSS 7.5) in The Wireshark Foundation Wireshark, published July 20, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.43%, the 89th percentile. Fixed in wireshark 3.4.7-r0.

References

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