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CVE Record

CVE-2021-20391: IBM QRadar User Behavior Analytics 1.0.0 through 4.1.0 allows web pages to be stored locally which can be r...

IBM QRadar User Behavior Analytics 1.0.0 through 4.1.0 allows web pages to be stored locally which can be read by another user on the system. IBM X-Force ID: 195999.

MediumCVSS 4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a local information disclosure issue in IBM QRadar User Behavior Analytics. Affected versions can store web pages locally in a way that another user on the same system may read. The main business concern is confidentiality, especially because QRadar environments often contain security monitoring context.

Executive priority

Schedule remediation through normal vulnerability management, with higher priority for shared QRadar hosts or environments containing sensitive monitoring data. The issue is not described as remotely exploitable or actively exploited in the provided sources.

Technical view

CVE-2021-20391 affects IBM QRadar User Behavior Analytics 1.0.0 through 4.1.0. The CVSS 3.0 score is 4.0, with local attack vector, low complexity, no user interaction, and low confidentiality impact only. The bundle cites IBM X-Force ID 195999.

Likely exposure

Exposure is likely limited to environments running IBM QRadar User Behavior Analytics in the affected version range, especially systems with multiple local users or shared administrative access. The source bundle does not establish remote network exploitability.

Exploitation context

The source bundle does not show active exploitation, and the CVE is not listed as KEV. The CVSS vector marks exploit code maturity as unproven. Treat this as a confidentiality weakness requiring remediation, not as evidence of ongoing exploitation.

Researcher notes

The evidence describes local read exposure of stored web pages, but does not provide detailed file paths, exploit prerequisites beyond local access, or precise remediation steps. Use IBM’s advisory and X-Force entry as the authoritative sources for fix validation.

Mitigation direction

  • Inventory QRadar User Behavior Analytics versions across all QRadar deployments.
  • Check IBM advisory guidance for the official remediation path.
  • Upgrade or apply IBM-provided fixes where the affected range is present.
  • Restrict local system access to trusted administrators until remediated.
  • Review local file permissions for exposed stored web content.

Validation and detection

  • Confirm whether QRadar User Behavior Analytics 1.0.0 through 4.1.0 is installed.
  • Verify the installed version after applying IBM guidance.
  • Check whether multiple local users can access the QRadar host.
  • Review local storage locations for unintended readable web page artifacts.
  • Document compensating access controls if immediate remediation is delayed.
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-2021-20391 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4 (3.0)
Known Exploited
No
Published

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

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
4CVSS 3.0MediumCVSS:3.0/S:U/C:L/A:N/AV:L/UI:N/AC:L/I:N/PR:N/RL:O/E:U/RC:C2.51.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

4Medium
CVSS 3.0 vector shape for CVE-2021-20391Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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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