CVE-2022-0586Public exploitNetwork attack vector

CPU exhaustion via AMF length integer underflow

Published Feb 14, 2022 · Updated Nov 3, 2025

Infinite loop in Wireshark's RTMPT dissector 3.4.0 through 3.4.11 and 3.6.0 through 3.6.1 allows remote attackers to exhaust CPU. The rtmpt_get_amf_length function stores an attacker-controlled AMF length in a signed integer, allowing a negative value to keep its offset at zero and its loop condition true indefinitely. Packet injection requires Wireshark or TShark to capture and dissect the malformed RTMP traffic; opening a crafted capture file provides the same service-interrupt path.

CVSS severity7.5
High
EPSS probability2.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Infinite loop in Wireshark's RTMPT dissector 3.4.0 through 3.4.11 and 3.6.0 through 3.6.1 allows remote attackers to exhaust CPU. The rtmpt_get_amf_length function stores an attacker-controlled AMF length in a signed integer, allowing a negative value to keep its offset at zero and its loop condition true indefinitely. Packet injection requires Wireshark or TShark to capture and dissect the malformed RTMP traffic; opening a crafted capture file provides the same service-interrupt path.

The record

CVE
CVE-2022-0586
Published
Feb 14, 2022
Updated
Nov 3, 2025
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-835, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=>=3.4.0, <3.4.12
  2. Affected versionversion=>=3.6.0, <3.6.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wireshark Foundation · Wiresharkversion=>=3.4.0, <3.4.12; version=>=3.6.0, <3.6.2

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Endpoint Denial of Service: Application 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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