Db2Application · Ibm
CVE-2023-30443
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 · uneditedIBM 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.
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 confidenceIBM Db2 versions 10.5, 11.1, and 11.5 are vulnerable to a denial of service condition when processing a specially crafted query. The vulnerability allows an authenticated attacker to cause the database to become unavailable, likely through resource exhaustion or an unhandled exception in query parsing/execution.
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
Db2Application
= 10.5= 11.1= 11.5CVSS 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
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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 checksWork through these to decide whether this CVE applies to you.
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Check IBM Db2 installed versionRun the command 'db2level' or query 'SELECT GET_VARCHAR_FOR_BIT_DATA(SERVICE_LEVEL) AS VERSION FROM SYSIBM.SYSDUMMY1' to retrieve the installed Db2 versionAffected if The version displayed is 10.5, 11.1, or 11.5 specifically (note: later fix packs within these major versions may include the fix)
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Verify authentication is enabledCheck db2 configuration by running 'db2 get dbm cfg' and look for AUTHENTICATION parameter in the Database Manager Configuration outputAffected if AUTHENTICATION is set to any value other than NONE, meaning users must authenticate to access the database (the vulnerability requires an authenticated attacker)
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Review database diagnostic logs for DoS indicatorsExamine the db2diag.log file (typically located in DB2_HOME/sqllib/db2diag.log) for entries indicating abnormal termination, exceptions, or crashes related to query processingAffected if Recent entries show unexpected process termination, unhandled exceptions, or resource exhaustion errors tied to specific query executions
You are affected if you are running IBM Db2 version 10.5, 11.1, or 11.5 without the applicable security patch and your database accepts authenticated user connections.
Generated from the published advisory. Verify against your own configuration.
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 dataApply the appropriate IBM Db2 patch or fix pack that addresses this vulnerability. Restrict database access to trusted users and monitor for abnormal query patterns until patches can be applied.
Fix this in Db2
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,616.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-30443 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-30443 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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