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CVE-2021-4185

Infinite loop in the RTMPT dissector in Wireshark 3.6.0 and 3.4.0 to 3.4.10 allows denial of...

7.5 HighFix available

Infinite loop in the RTMPT 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

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

4.06%Up 3.0 points since Dec 31, 2021
90%50%10%1%

What each source reports

CVE List Score used 7.5

Infinite loop in the RTMPT 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

Record
CVE-2021-4185
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-2021-34045 7.5

Infinite loop in the RTMPT 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

Record
EUVD-2021-34045
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
GitHub AdvisoriesGHSA-wm4g-hw88-g25h 7.5

Infinite loop in the RTMPT dissector in Wireshark 3.6.0 and 3.4.0 to 3.4.10 allows denial of...

Infinite loop in the RTMPT 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

Record
GHSA-wm4g-hw88-g25h
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

Infinite loop in the RTMPT 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

Record
CVE-2021-4185
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-2021-4185 7.5

Infinite loop in the RTMPT 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

Record
ALPINE-CVE-2021-4185
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-7420 7.5

CVE-2021-4185 affecting package wireshark for versions less than 3.4.14-1

Infinite loop in the RTMPT 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

Record
AZL-7420
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
Show 10 moreShow less
OSV 7.5

Infinite loop in the RTMPT 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

Record
CVE-2021-4185
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-2021-4185 7.5

Infinite loop in the RTMPT 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

Record
DEBIAN-CVE-2021-4185
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
OSVOESA-2022-1610 8.8

wireshark security update

Wireshark allows you to examine protocol data stored in files or as it is captured from wired or wireless (WiFi or Bluetooth) networks, USB devices, and many other sources. It supports dozens of protocol capture file formats and understands more than a thousand protocols.

Security Fix(es):

Excessive memory consumption in MS-WSP dissector in Wireshark 3.4.0 to 3.4.4 and 3.2.0 to 3.2.12 allows denial of service via packet injection or crafted capture file(CVE-2021-22207)

Improper URL handling in Wireshark 3.4.0 to 3.4.3 and 3.2.0 to 3.2.11 could allow remote code execution via via packet injection or crafted capture file.(CVE-2021-22191)

Crash in the Sysdig Event 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(CVE-2021-4181)

Infinite loop in the RTMPT 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(CVE-2021-4185)

Record
OESA-2022-1610
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-4185 7.5

Infinite loop in the RTMPT 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

Record
UBUNTU-CVE-2021-4185
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
OSVCLSA-2026-1777312619 No score

wireshark: Fix of CVE-2021-4185

  • CVE-2021-4185: fix infinite loop in RTMPT dissector on TCP sequence wraparound
Record
CLSA-2026-1777312619
Updated
2026-11-02
OSVMGASA-2022-0004 No score

Updated wireshark packages fix security vulnerability

Several wireshark vulnerabilities have been fixed. See the release notes for details.

Record
MGASA-2022-0004
Updated
2026-11-02
OSVopenSUSE-SU-2022:0375-1 No score

Security update for wireshark

This update for wireshark fixes the following issues:

Update to version 3.6.1:

  • CVE-2021-4185: RTMPT dissector infinite loop (bsc#1194166)
  • CVE-2021-4184: BitTorrent DHT dissector infinite loop (bsc#1194167)
  • CVE-2021-4183: pcapng file parser crash (bsc#1194168)
  • CVE-2021-4182: RFC 7468 file parser infinite loop (bsc#1194169)
  • CVE-2021-4181: Sysdig Event dissector crash (bsc#1194170)
  • CVE-2021-4190: Kafka dissector infinite loop (bsc#1194171)
  • Support for Shared Memory Communications (SMC) (jsc#SLE-18727)
Record
openSUSE-SU-2022:0375-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11703-1 No score

libwireshark15-3.6.1-1.1 on GA media

These are all security issues fixed in the libwireshark15-3.6.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11703-1
Updated
2026-11-02
OSVSUSE-SU-2022:0375-1 No score

Security update for wireshark

This update for wireshark fixes the following issues:

Update to version 3.6.1:

  • CVE-2021-4185: RTMPT dissector infinite loop (bsc#1194166)
  • CVE-2021-4184: BitTorrent DHT dissector infinite loop (bsc#1194167)
  • CVE-2021-4183: pcapng file parser crash (bsc#1194168)
  • CVE-2021-4182: RFC 7468 file parser infinite loop (bsc#1194169)
  • CVE-2021-4181: Sysdig Event dissector crash (bsc#1194170)
  • CVE-2021-4190: Kafka dissector infinite loop (bsc#1194171)
  • Support for Shared Memory Communications (SMC) (jsc#SLE-18727)
Record
SUSE-SU-2022:0375-1
Updated
2026-11-02
OSVUSN-7552-1 No score

wireshark vulnerabilities

It was discovered that Wireshark did not correctly handle recursion. If a user or system were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-39929)

Roman Donchenko discovered that Wireshark did not correctly handle parsing certain files. If a user or system were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2021-4182)

It was discovered that Wireshark did not correctly handle parsing certain files. If a user or system were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-4185, CVE-2022-0581)

It was discovered that Wireshark did not correctly handle parsing certain files. If a user or system were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2021-4186)

Sharon Brizinov discovered that Wireshark did not correctly handle parsing certain files. If a user or system were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2022-0582, CVE-2022-0583, CVE-2022-0586)

Sharon Brizinov discovered that Wireshark did not correctly handle parsing certain files. If a user or system were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2022-0585)

Jason Cohen discovered that Wireshark did not correctly handle parsing certain files. If a user or system were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 22.04 LTS. (CVE-2022-3190)

Record
USN-7552-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
wireshark
Alpine:v3.15
3.4.0 up to 3.4.13-r0
3.4.13-r0
wireshark
Alpine:v3.16
3.4.0 up to 3.4.11-r0
3.4.11-r0
wireshark
Alpine:v3.17
3.4.0 up to 3.4.11-r0
3.4.11-r0
wireshark
Alpine:v3.18
3.4.0 up to 3.4.11-r0
3.4.11-r0
wireshark
Alpine:v3.19
3.4.0 up to 3.4.11-r0
3.4.11-r0
wireshark
Alpine:v3.20
3.4.0 up to 3.4.11-r0
3.4.11-r0
wireshark
Alpine:v3.21
3.4.0 up to 3.4.11-r0
3.4.11-r0
wireshark
Alpine:v3.22
3.4.0 up to 3.4.11-r0
3.4.11-r0
wireshark
Alpine:v3.23
3.4.0 up to 3.4.11-r0
3.4.11-r0
wireshark
Alpine:v3.24
3.4.0 up to 3.4.11-r0
3.4.11-r0
Show 48 moreShow less
Affected packages
PackageAffectedFixed
wireshark
Azure Linux:2
before 3.4.14-1
3.4.14-1
wireshark
TuxCare:AlmaLinux:9.2
before 1:3.4.10-4.el9.tuxcare.els6
1:3.4.10-4.el9.tuxcare.els6
wireshark-cli
TuxCare:AlmaLinux:9.2
before 1:3.4.10-4.el9.tuxcare.els6
1:3.4.10-4.el9.tuxcare.els6
wireshark-devel
TuxCare:AlmaLinux:9.2
before 1:3.4.10-4.el9.tuxcare.els6
1:3.4.10-4.el9.tuxcare.els6
wireshark
Debian:12
before 3.6.2-1
3.6.2-1
wireshark
Debian:13
before 3.6.2-1
3.6.2-1
wireshark
Debian:14
before 3.6.2-1
3.6.2-1
wireshark
Debian:9
From an advisory covering 9 CVEs
before 2.6.20-0+deb9u3, 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 26 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+deb9u12.6.20-0+deb9u22.6.3-12.6.3-1~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+deb9u3
wireshark
Debian:11
From an advisory covering 47 CVEs
before 3.4.16-0+deb11u1, plus listed versions
3.4.10-0+deb11u13.4.4-13.4.6-1~exp13.4.7-13.4.7-1~exp13.4.8-13.4.9-1
3.4.16-0+deb11u1
wireshark
Mageia:8
From an advisory covering 5 CVEs
before 3.4.11-1.mga8
3.4.11-1.mga8
wireshark
openEuler:20.03-LTS-SP1
From an advisory covering 4 CVEs
before 2.6.2-21.oe1
2.6.2-21.oe1
wireshark
openEuler:20.03-LTS-SP2
From an advisory covering 4 CVEs
before 2.6.2-21.oe1
2.6.2-21.oe1
wireshark
openEuler:20.03-LTS-SP3
From an advisory covering 4 CVEs
before 2.6.2-21.oe1
2.6.2-21.oe1
libvirt
SUSE:Linux Enterprise Module for Basesystem 15 SP3
From an advisory covering 6 CVEs
before 7.1.0-150300.6.23.1
7.1.0-150300.6.23.1
wireshark
SUSE:Linux Enterprise Module for Basesystem 15 SP3
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise Module for Desktop Applications 15 SP3
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
libvirt
SUSE:Linux Enterprise Module for Server Applications 15 SP3
From an advisory covering 6 CVEs
before 7.1.0-150300.6.23.1
7.1.0-150300.6.23.1
wireshark
SUSE:Linux Enterprise High Performance Computing 15-ESPOS
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise High Performance Computing 15-LTSS
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise High Performance Computing 15 SP2-ESPOS
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise Server 15-LTSS
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise Server 15 SP1-BCL
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise Server 15 SP1-LTSS
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise Server 15 SP2-BCL
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise Server 15 SP2-LTSS
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise Server for SAP Applications 15
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise Server for SAP Applications 15 SP1
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Linux Enterprise Server for SAP Applications 15 SP2
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Manager Proxy 4.1
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Manager Retail Branch Server 4.1
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Manager Server 4.1
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
libvirt
SUSE:Linux Enterprise Micro 5.1
From an advisory covering 6 CVEs
before 7.1.0-150300.6.23.1
7.1.0-150300.6.23.1
wireshark
SUSE:Enterprise Storage 6
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
SUSE:Enterprise Storage 7
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
Ubuntu:Pro:14.04:LTS
before 2.6.10-1~ubuntu14.04.0~esm3, plus listed versions
1.10.2-11.10.3-11.10.5-1ubuntu11.10.5-21.10.6-1
Show 8 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~esm2
2.6.10-1~ubuntu14.04.0~esm3
wireshark
Ubuntu:Pro:16.04:LTS
before 2.6.10-1~ubuntu16.04.0+esm2, 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 7 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+esm1
2.6.10-1~ubuntu16.04.0+esm2
wireshark
Ubuntu:Pro:18.04:LTS
before 2.6.10-1~ubuntu18.04.0+esm2, plus listed versions
2.4.2-12.4.3-12.4.4-12.4.5-12.6.3-1~ubuntu18.04.1
Show 6 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+esm1
2.6.10-1~ubuntu18.04.0+esm2
wireshark
Ubuntu:Pro:14.04:LTS
From an advisory covering 10 CVEs
before 2.6.10-1~ubuntu14.04.0~esm3, plus listed versions
1.10.2-11.10.3-11.10.5-1ubuntu11.10.5-21.10.6-1
Show 8 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~esm2
2.6.10-1~ubuntu14.04.0~esm3
wireshark
Ubuntu:Pro:16.04:LTS
From an advisory covering 10 CVEs
before 2.6.10-1~ubuntu16.04.0+esm2, 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 7 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+esm1
2.6.10-1~ubuntu16.04.0+esm2
wireshark
Ubuntu:Pro:18.04:LTS
From an advisory covering 10 CVEs
before 2.6.10-1~ubuntu18.04.0+esm2, plus listed versions
2.4.2-12.4.3-12.4.4-12.4.5-12.6.3-1~ubuntu18.04.1
Show 6 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+esm1
2.6.10-1~ubuntu18.04.0+esm2
wireshark
Ubuntu:Pro:20.04:LTS
From an advisory covering 10 CVEs
before 3.2.3-1ubuntu0.1~esm2, plus listed versions
3.0.5-13.0.7-13.2.1-13.2.2-13.2.3-13.2.3-1ubuntu0.1~esm1
3.2.3-1ubuntu0.1~esm2
wireshark
Ubuntu:Pro:22.04:LTS
From an advisory covering 10 CVEs
before 3.6.2-2ubuntu0.1~esm1, plus listed versions
3.4.7-1~exp13.4.9-13.6.2-1ubuntu13.6.2-2
3.6.2-2ubuntu0.1~esm1
libvirt
openSUSE:Leap 15.3
From an advisory covering 6 CVEs
before 7.1.0-150300.6.23.1
7.1.0-150300.6.23.1
wireshark
openSUSE:Leap 15.3
From an advisory covering 6 CVEs
before 3.6.1-3.68.1
3.6.1-3.68.1
wireshark
openSUSE:Tumbleweed
From an advisory covering 5 CVEs
before 3.6.1-1.1
3.6.1-1.1

History

History
RecordedChangedSources
affected, facts
affected, aliases, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2021-4185 is a high vulnerability (CVSS 7.5) in Wireshark, published December 30, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.06%, the 90th percentile. Fixed in wireshark 3.4.13-r0.

References

Show 50 moreShow less
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