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Tivoli Workload SchedulerApplication · Ibm

CVE-2021-20349

MEDIUM · 5.3 CVSS v3.1 Published 2021-08-09
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
55/100
Remediation priority · Elevated
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

IBM Tivoli Workload Scheduler 9.4 and 9.5 contains a stack-based buffer overflow vulnerability caused by improper bounds checking. A local attacker can exploit this by overflowing a buffer to potentially gain lower-level privileges on the system.

MitigationApply IBM security patches for this vulnerability (contact IBM support for fix availability) and restrict local system access to trusted, authorized users only.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Tivoli Workload SchedulerApplication
Affected:= 9.4= 9.5

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Verify Tivoli Workload Scheduler is installed
    Check for the presence of IBM Tivoli Workload Scheduler installation directories, services, or executables on the system
    Affected if The product is not installed on the system
  2. Identify installed version
    Locate and read version information for the Tivoli Workload Scheduler installation using native tools or documentation
    Affected if Unable to determine the installed version
  3. Confirm version matches affected releases
    Compare your installed version against the affected ranges: 9.4 and 9.5
    Affected if Installed version is 9.4 or 9.5
  4. Assess local access exposure
    Review system access controls and local user privileges to determine if untrusted local users could potentially trigger the vulnerable code path
    Affected if Untrusted local users have access to the system where TWS executes

You are affected if IBM Tivoli Workload Scheduler version 9.4 or 9.5 is installed and untrusted local users have system access.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply IBM security patches for this vulnerability (contact IBM support for fix availability) and restrict local system access to trusted, authorized users only.

Fix this in Tivoli Workload Scheduler Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-20349 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data