CVE-2021-39034Network attack vector

Authenticated queue-manager service interruption

Published Feb 17, 2022 · Updated Sep 16, 2024

Denial of service in the IBM MQ 9.1 LTS queue-manager channel process on Solaris allows remote authenticated users to interrupt service. IBM has not published the defective channel operation or the input that triggers the failure. Reaching the flaw requires queue-manager credentials and a high-complexity channel interaction, and successful exploitation interrupts the queue manager.

CVSS severity5.3
Medium
EPSS probability1.17%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in the IBM MQ 9.1 LTS queue-manager channel process on Solaris allows remote authenticated users to interrupt service. IBM has not published the defective channel operation or the input that triggers the failure. Reaching the flaw requires queue-manager credentials and a high-complexity channel interaction, and successful exploitation interrupts the queue manager.

The record

CVE
CVE-2021-39034
Published
Feb 17, 2022
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM MQ
Classifications
T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 17, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM MQversion=9.1.0

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3IBM CorporationCVSS:3.0/AV:N/AC:H/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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo