CVE-2025-33124
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 Merge Backup for Linux, UNIX and Windows 12.1.0.0 could allow an authenticated user to cause the program to crash due to the incorrect calculation of a buffer size.
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 Merge Backup version 12.1.0.0 contains a buffer size miscalculation flaw that can be triggered by an authenticated user, causing the program to crash. This appears to be an integer overflow or incorrect bounds calculation when determining buffer allocation sizes during merge backup operations.
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= 12.1.0.0CVSS 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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Identify DB2 installation and versionRun 'db2level' or check the DB2 installation directory for version information. On Linux/Unix, look in /opt/ibm/db2/version and check the output for version 12.1.0.0.Affected if The installed DB2 version is exactly 12.1.0.0 (no patches applied).
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Verify merge backup component is presentCheck if the DB2 Merge Backup utility (db2mergebackup or similar) exists in the DB2 bin directory. On Linux/Unix, typically under /opt/ibm/db2/V12.1/bin/ and look for merge backup related executables.Affected if The merge backup component is installed on the system.
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Confirm merge backup is configured or in useQuery DB2 system catalog tables or check DB2 configuration for any merge backup operations or schedules. Use 'db2 list history' or check for any stored procedures related to merge backup.Affected if Merge backup functionality has been configured, scheduled, or used previously on the database.
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Review crash or error logs for merge backup failuresExamine DB2 diagnostic logs (db2diag.log) for any recent crashes or errors related to merge backup operations, particularly those indicating buffer allocation or memory issues.Affected if There are recent crash logs or errors tied to merge backup operations in the DB2 diagnostic files.
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Check authenticated user access to merge backupReview DB2 permissions and user privileges for any accounts that have access to merge backup functions. Use 'db2get auth' or examine DB2 privileges granted to user groups.Affected if Multiple authenticated users or any non-essential accounts have privileges to execute merge backup operations.
A system is affected if it runs IBM DB2 version 12.1.0.0 with the merge backup component installed and accessible to authenticated users, especially if merge backup has been used or configured.
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 IBM's patch for CVE-2025-33124 when available. Until then, limit access to the DB2 Merge Backup functionality to only essential authenticated personnel and monitor for crashes.
- Consultation4.0 h
- Implementation8.0 h
- Testing8.0 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 $6,656.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-33124 — 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-2025-33124 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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