CVE-2025-3218
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 i 7.2, 7.3, 7.4, 7.5, and 7.6 is vulnerable to authentication and authorization attacks due to incorrect validation processing in IBM i Netserver. A malicious actor could use the weaknesses, in conjunction with brute force authentication attacks or to bypass authority restrictions, to access the server.
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 i Netserver (the SMB/CIFS file and print sharing service for IBM i) contains incorrect validation processing that can be exploited to facilitate authentication and authorization attacks. A remote attacker could leverage this weakness alongside brute force techniques to guess credentials more easily, or directly bypass existing authority restrictions to gain unauthorized access to the server and its resources.
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= 7.2= 7.3= 7.4= 7.5= 7.6CVSS 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
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
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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Verify IBM i system versionDisplay the system version using DSPSYSVAL QSWRSYSID or run GO CMDDSPSYSVAL and select option 1. The output shows the installed version (V7Rx).Affected if The installed version is 7.2, 7.3, 7.4, 7.5, or 7.6, placing it within the affected version range.
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Confirm Netserver is enabledUse WRKACTJOB JOB(NETSERVER) or check for active NETSERVER jobs via WRKACTJOB. Alternatively, check the system value QNTCENABLED or the Netserver configuration via CFGTCP option 20.Affected if Netserver jobs are active and the service is running, meaning the vulnerable component is exposed.
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Check if SMB ports are listeningUse NETSTAT *CNN or run WRKTCPSTS to view active TCP connections and listening ports. Verify if ports 445 (SMB) and/or 139 (NetBIOS) are in LISTEN state.Affected if Ports 445 and/or 139 are open and listening, exposing the service to network-based attackers.
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Review Netserver authentication logsReview job logs for NETSERVER subsystem jobs (option 10 from WRKACTJOB, select a NETSERVER job, then 5 to view job log). Look for repeated authentication failures or unexpected source IP addresses.Affected if Logs show unusually high failed login attempts or authentication anomalies that may indicate exploitation attempts.
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Check for unauthorized access attemptsReview system security audit journal (DSPSECJRN) for entries related to NETSERVER and SMB access, particularly entries with type AF (auth failure) or PA (profile swap) from unexpected sources.Affected if Audit journal reveals unauthorized access attempts or authority violations involving Netserver resources.
A user is affected if their IBM i system runs version 7.2-7.6 AND has Netserver enabled with accessible SMB ports (445/139), regardless of whether exploitation attempts are observed in logs.
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 i patches when released for this vulnerability. In the interim, restrict network access to Netserver ports (typically TCP 445/139), monitor for anomalous authentication patterns, and consider disabling Netserver if SMB file sharing is not required.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-3218 — 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-2025-3218 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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- Version or environment caveats, and links to real fixes
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