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CVE Record

CVE-2021-29763: IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) 11.1 and 11.5 under very specific conditi...

IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) 11.1 and 11.5 under very specific conditions, could allow a local user to keep running a procedure that could cause the system to run out of memory.and cause a denial of service. IBM X-Force ID: 202267.

MediumCVSS 5.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-29763 is a denial-of-service issue in IBM Db2 11.1 and 11.5. Under specific conditions, a local user could keep a procedure running until the system runs out of memory, disrupting database availability. The sources do not indicate data theft or remote exploitation.

Executive priority

Treat this as a service-availability risk for business systems backed by Db2. Prioritize internet-facing dependency mapping less than local access review, patch planning, and monitoring for production databases with many local or application-level operators.

Technical view

IBM Db2 for Linux, UNIX and Windows, including Db2 Connect Server, versions 11.1 and 11.5 are affected. CVSS 3.0 score is 5.1 with local attack vector, high attack complexity, no confidentiality or integrity impact, and high availability impact.

Likely exposure

Exposure is most likely on Db2 11.1 or 11.5 servers where local users, application accounts, or jobs can execute relevant procedures. Internet exposure alone is not the main risk signal because the CVSS vector is local.

Exploitation context

The provided bundle shows KEV status is false and CVSS exploit maturity is unproven. No cited source states active exploitation. Abuse would require local access and very specific conditions, but successful abuse could exhaust memory and interrupt database service.

Researcher notes

Evidence is limited to the CVE description, IBM X-Force ID 202267, IBM support reference, and NetApp advisory reference. The bundle does not provide procedure details, exploit steps, or named fixed versions, so validation should focus on version exposure and vendor advisory status.

Mitigation direction

  • Identify all Db2 11.1 and 11.5 deployments, including Db2 Connect Server.
  • Review IBM advisory 6489493 for fixed levels or vendor-directed remediation.
  • Restrict local shell, job, and database procedure execution access to trusted users.
  • Monitor Db2 hosts for sustained memory growth and runaway procedures.
  • Review NetApp advisory if dependent products embed or integrate affected Db2 components.

Validation and detection

  • Confirm installed Db2 version and edition on each database host.
  • Map local users, service accounts, and scheduled jobs with procedure execution ability.
  • Check vendor advisories for whether installed fix packs remediate CVE-2021-29763.
  • Review monitoring logs for memory exhaustion or abnormal long-running procedures.
  • Document compensating controls where immediate patching is not possible.
Prepared
Confidence
high
Sources
5

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-2021-29763 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.1 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/I:N/AV:L/S:U/PR:N/A:H/UI:N/C:N/AC:H/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
4Source 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
5.1CVSS 3.0MediumCVSS:3.0/I:N/AV:L/S:U/PR:N/A:H/UI:N/C:N/AC:H/RL:O/E:U/RC:C1.43.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.1Medium
CVSS 3.0 vector shape for CVE-2021-29763Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/I:N/AV:L/S:U/PR:N/A:H/UI:N/C:N/AC:H/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
IBMDB2 for Linux, UNIX and Windows11.1, 11.5Listed
Weakness

CWE details

No CWE listed

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