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CVE Record

CVE-2021-20349: IBM Tivoli Workload Scheduler 9.4 and 9.5 is vulnerable to a stack-based buffer overflow, caused by imprope...

IBM Tivoli Workload Scheduler 9.4 and 9.5 is vulnerable to a stack-based buffer overflow, caused by improper bounds checking. A local attacker could overflow a buffer and gain lower level privileges. IBM X-Force ID: 194599.

MediumCVSS 5.9Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

IBM Workload Scheduler 9.4 and 9.5 have a local stack-based buffer overflow issue. A person with local access to an affected system could trigger memory corruption and gain limited, lower-level privileges. The available sources rate this as medium severity, not a remote internet-facing takeover.

Executive priority

Prioritize normal vulnerability remediation for affected scheduler servers, especially shared administrative systems. Urgency increases where many users can log in locally or where scheduler hosts support sensitive operational workflows.

Technical view

CVE-2021-20349 is caused by improper bounds checking in IBM Tivoli Workload Scheduler 9.4 and 9.5. The CVSS 3.0 vector is AV:L/AC:L/PR:N/UI:N with low confidentiality, integrity, and availability impact. IBM X-Force tracks it as ID 194599.

Likely exposure

Exposure is limited to organizations running IBM Tivoli or Workload Scheduler versions 9.4 or 9.5. The source bundle does not identify other products, cloud services, or versions as affected.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation. The CVSS exploit code maturity value is unproven. Treat this as a local privilege-risk issue requiring remediation, not as evidence of current mass exploitation.

Researcher notes

The public bundle does not include affected components, exploit details, or patch identifiers. Validation should focus on version confirmation and IBM advisory mapping. Avoid assuming remote reachability because the CVSS attack vector is local.

Mitigation direction

  • Inventory IBM Workload Scheduler deployments and identify versions 9.4 and 9.5.
  • Review IBM advisory node 6479347 and X-Force ID 194599 for official remediation.
  • Apply IBM-provided fixes or upgrade guidance for affected deployments.
  • If remediation is delayed, reduce unnecessary local access to scheduler hosts.
  • Document remediation status and exceptions in vulnerability management records.

Validation and detection

  • Confirm installed IBM Workload Scheduler version on each relevant host.
  • Check asset records for Tivoli Workload Scheduler 9.4 or 9.5 naming.
  • Verify IBM fix level against the official advisory before closing findings.
  • Review local user access on affected scheduler servers.
  • Monitor vendor guidance for any revised remediation or exploitation information.
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-2021-20349 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.9 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AC:L/AV:L/S:U/UI:N/A:L/I:L/C:L/PR: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
5.9CVSS 3.0MediumCVSS:3.0/AC:L/AV:L/S:U/UI:N/A:L/I:L/C:L/PR:N/RC:C/E:U/RL:O2.53.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.9Medium
CVSS 3.0 vector shape for CVE-2021-20349Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AC:L/AV:L/S:U/UI:N/A:L/I:L/C:L/PR: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
IBMWorkload Scheduler9.4, 9.5Listed
Weakness

CWE details

No CWE listed

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