CVE-2021-38958

Denial of service via concurrency issue

Published Nov 30, 2021 · Updated Sep 16, 2024

Denial of service in IBM MQ Appliance 9.2 CD and 9.2 LTS allows local attackers to interrupt service via a concurrency issue. IBM identifies a concurrency defect but does not publish the affected routine or triggering input. Local access with no user interaction is required, and the documented consequence is loss of service availability without confidentiality or integrity impact.

CVSS severity5.1
Medium
EPSS probability0.21%
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 9.2 CD and 9.2 LTS allows local attackers to interrupt service via a concurrency issue. IBM identifies a concurrency defect but does not publish the affected routine or triggering input. Local access with no user interaction is required, and the documented consequence is loss of service availability without confidentiality or integrity impact.

The record

CVE
CVE-2021-38958
Published
Nov 30, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM MQ Appliance
Classifications
T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 30, 2021CVE 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

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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=9.2.0.0
  2. Affected versionversion=9.2.0.1
  3. Affected versionversion=9.2.0.2
  4. Affected versionversion=9.2.0.3
  5. Affected versionversion=9.2.1
  6. Affected versionversion=9.2.2
  7. Affected versionversion=9.2.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

IBM · IBM MQ Applianceversion=9.2.0.0; version=9.2.0.1; version=9.2.0.2; version=9.2.0.3; version=9.2.1; version=9.2.2; version=9.2.3

Published CVSS scores

4.5IBM X-ForceCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
5.1IBMCVSS:3.0/AV:L/AC:H/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)
Vectorlocal
Privilegesunauthenticated
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

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Your stack

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