CVE-2020-4931Network attack vector

AMQP channel denial of service via message processing

Published Feb 24, 2021 · Updated Sep 17, 2024

Denial of service in IBM MQ Appliance 9.1 LTS, 9.2 LTS, and 9.1 CD allows remote authenticated users to disrupt AMQP channels. The AMQP Channel function in the queue manager processes attacker-supplied messages incorrectly; IBM has not disclosed the specific parser or operation responsible. Successful exploitation requires authenticated network access to an enabled AMQP channel and affects availability only, without reported data exposure or modification.

CVSS severity6.5
Medium
EPSS probability1.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in IBM MQ Appliance 9.1 LTS, 9.2 LTS, and 9.1 CD allows remote authenticated users to disrupt AMQP channels. The AMQP Channel function in the queue manager processes attacker-supplied messages incorrectly; IBM has not disclosed the specific parser or operation responsible. Successful exploitation requires authenticated network access to an enabled AMQP channel and affects availability only, without reported data exposure or modification.

The record

CVE
CVE-2020-4931
Published
Feb 24, 2021
Updated
Sep 17, 2024
Vendor
IBM
Product
IBM MQ Appliance
Classifications
T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=9.1.0.0
  2. Affected versionversion=9.1.0.1
  3. Affected versionversion=9.1.0.2
  4. Affected versionversion=9.1.0.3
  5. Affected versionversion=9.1.0.4
  6. Affected versionversion=9.1.0.5
  7. Affected versionversion=9.1.0.6
  8. Affected versionversion=9.1.1
  9. Affected versionversion=9.1.2
  10. Affected versionversion=9.1.3
  11. Affected versionversion=9.1.4
  12. Affected versionversion=9.1.5
  13. Affected versionversion=9.2.0.0
  14. Affected versionversion=9.2.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM MQ Applianceversion=9.1.0.0; version=9.1.0.1; version=9.1.0.2; version=9.1.0.3; version=9.1.0.4; version=9.1.0.5; version=9.1.0.6; version=9.1.1; version=9.1.2; version=9.1.3; version=9.1.4; version=9.1.5; version=9.2.0.0; version=9.2.0.1

Published CVSS scores

6.5IBM CorporationCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:N/A:P
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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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