LiveActive security incident?Get immediate response
CVE Record

CVE-2020-4592: IBM MQ Appliance 9.1.CD and LTS could allow an authenticated user, under nondefault configuration to cause...

IBM MQ Appliance 9.1.CD and LTS could allow an authenticated user, under nondefault configuration to cause a data corruption attack due to an error when using segmented messages.

MediumCVSS 5.3Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-4592 is an IBM MQ Appliance issue that can let an authenticated user corrupt data when segmented messages are used under a nondefault configuration. The business impact is integrity loss, not confidentiality or availability, based on the supplied CVSS vector.

Executive priority

Treat as a targeted integrity risk, not a broad emergency. Prioritize systems where IBM MQ carries financial, operational, or regulated data and where segmented messages are used.

Technical view

IBM MQ Appliance 9.1.LTS and 9.1.CD are affected. The flaw requires network access, low privileges, high attack complexity, and no user interaction. The CVSS 3.0 score is 5.3, with high integrity impact and no stated confidentiality or availability impact.

Likely exposure

Exposure appears limited to IBM MQ Appliance 9.1 LTS or CD deployments using the affected nondefault segmented-message configuration. Organizations not running IBM MQ Appliance, or not using that configuration, are less likely to be exposed.

Exploitation context

The source bundle marks KEV as false and CVSS exploit maturity as unproven. There is no cited evidence of active exploitation. An attacker would need authenticated access and the relevant nondefault message segmentation conditions.

Researcher notes

The provided evidence does not identify the exact nondefault setting, patch level, or workaround details. Validation should focus on version, segmented-message usage, and IBM advisory alignment without assuming broader IBM MQ product exposure.

Mitigation direction

  • Identify IBM MQ Appliance 9.1 LTS and CD instances.
  • Check IBM's advisory for the affected fixed level or workaround.
  • Apply IBM-recommended remediation for CVE-2020-4592.
  • Restrict authenticated MQ access to trusted users and networks.
  • Review segmented-message usage and related nondefault configuration.

Validation and detection

  • Inventory IBM MQ Appliance versions across environments.
  • Confirm whether segmented messages are enabled or used.
  • Compare appliance fix levels against IBM's advisory.
  • Review access controls for authenticated MQ users.
  • Monitor integrity-sensitive MQ workflows for unexplained data corruption.
Prepared
Confidence
medium
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2020-4592 mapping review

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

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (3.0)
Known Exploited
No
Published

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

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/PR:L/AV:N/AC:H/S:U/UI:N/I:H/C:N/A:N/RL:O/RC:C/E:U1.63.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.3Medium
CVSS 3.0 vector shape for CVE-2020-4592Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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
IBMMQ Appliance9.1.LTS, 9.1.CDListed
Weakness

CWE details

No CWE listed

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