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CVE Record

CVE-2021-20431: IBM i2 Analyst's Notebook Premium 9.2.0, 9.2.1, and 9.2.2 does not invalidate session after logout which co...

IBM i2 Analyst's Notebook Premium 9.2.0, 9.2.1, and 9.2.2 does not invalidate session after logout which could allow an an attacker to obtain sensitive information from the system. IBM X-Force ID: 196342.

MediumCVSS 4.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-20431 is a session-management flaw in IBM i2 Analyst's Notebook Premium. In affected versions, logging out may not invalidate the session, which could let someone with access to a still-valid session view sensitive information. The published severity is medium, with limited confidentiality impact and no integrity or availability impact stated.

Executive priority

Treat this as a moderate-priority remediation item for environments using affected IBM i2 versions, especially where sensitive investigative data is present. It is not described as actively exploited in the provided sources, but it weakens logout protections and should be fixed through IBM guidance.

Technical view

IBM reports that i2 Analyst's Notebook Premium 9.2.0, 9.2.1, and 9.2.2 fail to invalidate sessions after logout. The CVSS 3.0 score is 4.3 with network attack vector, low complexity, no privileges required, user interaction required, and low confidentiality impact. The CVSS vector marks remediation level as official fix, but the bundle does not name a fixed version.

Likely exposure

Exposure is limited to organizations running IBM i2 Analyst's Notebook Premium versions 9.2.0, 9.2.1, or 9.2.2. The main business concern is unintended access to sensitive investigative or analytical information through a session that should have ended.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. IBM X-Force lists exploit maturity as unproven in the provided CVSS vector. User interaction is required, so risk depends on how sessions are handled, shared workstations, browser use, and access controls.

Researcher notes

The available evidence identifies affected versions and impact, but not detailed exploit conditions or a fixed version. Avoid assuming broader IBM i2 product exposure. Validation should focus on server-side session invalidation after logout and whether vendor remediation has been applied.

Mitigation direction

  • Identify any IBM i2 Analyst's Notebook Premium 9.2.0, 9.2.1, or 9.2.2 deployments.
  • Review IBM advisory guidance and apply the official vendor fix or upgrade path.
  • Restrict access to affected systems until remediation is complete.
  • Require reauthentication for sensitive workflows where feasible.
  • Monitor for suspicious access after user logout events.

Validation and detection

  • Confirm installed IBM i2 Analyst's Notebook Premium versions across endpoints and servers.
  • Check whether IBM's advisory fix has been applied.
  • In authorized testing, verify logout invalidates the session server-side.
  • Review logs for access continuing after logout timestamps.
  • Document compensating controls if vendor 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-2021-20431 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.3 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/I:N/A:N/AV:N/UI:R/C:L/AC:L/PR:N/S:U/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
4.3CVSS 3.0MediumCVSS:3.0/I:N/A:N/AV:N/UI:R/C:L/AC:L/PR:N/S:U/RL:O/E:U/RC:C2.81.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

4.3Medium
CVSS 3.0 vector shape for CVE-2021-20431Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/I:N/A:N/AV:N/UI:R/C:L/AC:L/PR:N/S:U/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
IBMi2 Analyst's Notebook Premium9.2.0, 9.2.1, 9.2.2Listed
Weakness

CWE details

No CWE listed

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