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CVE Record

CVE-2021-20393: IBM QRadar User Behavior Analytics 1.0.0 through 4.1.0 could allow a remote attacker to obtain sensitive in...

IBM QRadar User Behavior Analytics 1.0.0 through 4.1.0 could allow a remote attacker to obtain sensitive information when a detailed technical error message is returned in the browser. This information could be used in further attacks against the system. IBM X-Force ID: 196001.

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This issue can expose sensitive technical details from IBM QRadar User Behavior Analytics error pages. The leak is not described as direct data theft or system takeover, but the information could help an attacker plan later attacks against the QRadar environment.

Executive priority

Handle as a moderate-priority exposure reduction item for QRadar environments. It does not indicate active exploitation or direct compromise, but QRadar is security-critical infrastructure, and leaked technical detail can materially assist follow-on attacks.

Technical view

CVE-2021-20393 affects IBM QRadar User Behavior Analytics 1.0.0 through 4.1.0 according to the CVE description. It is a remotely reachable information disclosure issue where detailed technical browser errors may reveal sensitive information. CVSS 3.0 score is 5.3, with network attack vector, low complexity, and no privileges or user interaction required.

Likely exposure

Exposure is most relevant where IBM QRadar User Behavior Analytics is deployed and browser-accessible to untrusted networks or users. The provided bundle has inconsistent affected-version data, so validate against IBM’s advisory before scoping remediation.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. IBM rates exploit maturity as unproven in the provided CVSS vector. The practical risk is attacker reconnaissance through technical error details.

Researcher notes

The provided data lacks CWE classification and detailed IBM remediation text. The affected product field says QRadar SIEM, while the description names QRadar User Behavior Analytics. Use IBM’s advisory as the authority when resolving product and version scope.

Mitigation direction

  • Identify all IBM QRadar User Behavior Analytics deployments and versions.
  • Check IBM advisory 6453109 for the supported fix or upgrade path.
  • Prioritize systems running versions described as 1.0.0 through 4.1.0.
  • Limit browser access to QRadar UBA to trusted administrative paths.
  • Review vendor guidance before changing error-handling behavior.

Validation and detection

  • Confirm whether QRadar User Behavior Analytics is installed in the environment.
  • Record installed UBA versions and compare them with IBM’s advisory.
  • Test from an unprivileged browser session for detailed technical error disclosure.
  • Review web logs for repeated error-triggering against UBA endpoints.
  • Confirm remediation using the same non-destructive browser checks.
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

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CVE-2021-20393 mapping review

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

Vector: CVSS:3.0/AV:N/C:L/A:N/S:U/PR:N/I:N/AC:L/UI:N/RC:C/RL:O/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/AV:N/C:L/A:N/S:U/PR:N/I:N/AC:L/UI:N/RC:C/RL:O/E:U3.91.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.3Medium
CVSS 3.0 vector shape for CVE-2021-20393Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/C:L/A:N/S:U/PR:N/I:N/AC:L/UI:N/RC:C/RL:O/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
IBMQRadar SIEM1.0.0, 4.1.1Listed
Weakness

CWE details

No CWE listed

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