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CVE Record

CVE-2023-30449: IBM Db2 denial of service

IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) 10.5, 11.1, and 11.5 is vulnerable to denial of service with a specially crafted query. IBM X-Force ID: 253439.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This vulnerability can let an unauthenticated network attacker disrupt IBM Db2 service availability using a specially crafted query. The impact is denial of service, not data theft or code execution based on the provided sources. It matters most where Db2 supports business-critical applications or externally reachable database services.

Executive priority

Treat as high priority for availability-sensitive systems. This is not supported as actively exploited in the provided sources, but unauthenticated network denial of service against critical databases can still create business disruption.

Technical view

CVE-2023-30449 affects IBM Db2 for Linux, UNIX and Windows, including Db2 Connect Server, versions 10.5, 11.1, and 11.5. IBM describes denial of service via a specially crafted query. CVSS 3.1 is 7.5: network reachable, low complexity, no privileges, no user interaction, availability high impact.

Likely exposure

Exposure is most likely in environments running IBM Db2 LUW or Db2 Connect Server 10.5, 11.1, or 11.5. Risk is higher where database listeners are reachable from untrusted networks or where applications pass untrusted query input to Db2.

Exploitation context

The provided bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates practical remote reachability without authentication, but the sources only support denial of service via crafted query, not compromise or data access.

Researcher notes

Evidence is limited to IBM’s CVE description, X-Force identifier 253439, CVSS metadata, and referenced advisories. Do not infer affected products beyond IBM Db2 LUW and Db2 Connect Server versions listed. No exploit code, patch level, or active exploitation evidence is present in the bundle.

Mitigation direction

  • Inventory IBM Db2 LUW and Db2 Connect Server versions across production and disaster recovery systems.
  • Review IBM advisory 7010557 for vendor-specified fixes or maintenance levels.
  • Prioritize remediation for internet-facing or business-critical Db2 services.
  • Restrict Db2 network access to trusted application hosts and administrative networks.
  • Monitor Db2 logs and service health for query-triggered crashes or repeated availability faults.

Validation and detection

  • Confirm whether Db2 versions 10.5, 11.1, or 11.5 are deployed.
  • Map database listener exposure from internal, partner, and external network paths.
  • Check vendor advisory status before asserting a fixed build or workaround.
  • Review recent Db2 outages for unexplained crashes tied to query activity.
  • Verify compensating network controls limit unauthenticated database access.
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-20: Exact CWE lookup

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cve · low confidence lookup

CVE-2023-30449 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

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

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
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2023-30449Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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 Windows10.5, 11.1, 11.5unaffected
Weakness

CWE details

CWE-20

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