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CVE Record

CVE-2021-39034: IBM MQ 9.1 LTS is vulnerable to a denial of service attack caused by an issue within the channel process.

IBM MQ 9.1 LTS is vulnerable to a denial of service attack caused by an issue within the channel process. IBM X-Force ID: 213964.

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

IBM MQ 9.1 LTS has a denial-of-service issue in its channel process. A successful attack could disrupt MQ availability, but the CVSS data indicates high attack complexity and low privileges are required. Treat this as a moderate operational risk for environments that depend on MQ messaging uptime.

Executive priority

Prioritize remediation for business-critical MQ systems where messaging downtime would affect operations. The issue is not shown as actively exploited, but availability impact can be high in dependent environments.

Technical view

CVE-2021-39034 affects IBM MQ 9.1.0 / 9.1 LTS. The issue is within the channel process and can cause denial of service. CVSS 3.0 score is 5.3, with network attack vector, low privileges required, high complexity, no confidentiality or integrity impact, and high availability impact.

Likely exposure

Exposure is likely limited to organizations running IBM MQ 9.1 LTS or the affected 9.1.0 release, especially where MQ channel services are reachable over the network by authenticated or low-privileged users.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation. The CVSS vector lists exploit maturity as unproven. No public exploit details are provided in the supplied sources.

Researcher notes

Key unknowns in the bundle include exact fixed versions, configuration prerequisites, and practical exploitability. Do not assume impact beyond IBM MQ 9.1 LTS / 9.1.0 without confirming vendor guidance.

Mitigation direction

  • Inventory IBM MQ 9.1 LTS and 9.1.0 deployments.
  • Review IBM advisory and X-Force entry for fixed levels or interim fixes.
  • Apply IBM-supported maintenance for affected MQ installations.
  • Restrict MQ channel access to trusted clients and networks.
  • Monitor MQ channel process failures, restarts, and availability alerts.

Validation and detection

  • Confirm deployed IBM MQ versions and LTS maintenance levels.
  • Identify MQ channel endpoints exposed to user or application networks.
  • Check IBM guidance for whether each instance is affected.
  • Review MQ logs for channel process crashes or abnormal restarts.
  • Verify monitoring alerts on MQ service availability and queue processing.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-39034 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/S:U/C:N/AC:H/PR:L/I:N/A:H/UI:N/AV:N/RC:C/E:U/RL:O

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.3CVSS 3.0MediumCVSS:3.0/S:U/C:N/AC:H/PR:L/I:N/A:H/UI:N/AV:N/RC:C/E:U/RL:O1.63.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.3Medium
CVSS 3.0 vector shape for CVE-2021-39034Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/S:U/C:N/AC:H/PR:L/I:N/A:H/UI:N/AV:N/RC:C/E:U/RL:O

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
IBMMQ9.1.0Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.