CVE-2021-22207Public exploitNetwork attack vector

Denial of service via MS-WSP resource exhaustion

Published Apr 23, 2021 · Updated Aug 3, 2024

Resource exhaustion in the MS-WSP dissector in Wireshark 3.4.0 through 3.4.4 and 3.2.0 through 3.2.12 allows attackers to interrupt analysis. The dissector consumes excessive memory and CPU while parsing malformed packet data, but the vendor has not published the exact unbounded operation. The input must be injected onto a monitored network or opened as a crafted capture file, and successful processing exhausts analyzer resources.

CVSS severity5.5
Medium
EPSS probability2.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Resource exhaustion in the MS-WSP dissector in Wireshark 3.4.0 through 3.4.4 and 3.2.0 through 3.2.12 allows attackers to interrupt analysis. The dissector consumes excessive memory and CPU while parsing malformed packet data, but the vendor has not published the exact unbounded operation. The input must be injected onto a monitored network or opened as a crafted capture file, and successful processing exhausts analyzer resources.

The record

CVE
CVE-2021-22207
Published
Apr 23, 2021
Updated
Aug 3, 2024
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>=3.2.0, <3.2.13
  2. Affected versionversion=>=3.4.0, <3.4.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Wireshark Foundation · Wiresharkversion=>=3.2.0, <3.2.13; version=>=3.4.0, <3.4.5

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
5.5GitLab Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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