CVE-2023-42480
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 · uneditedThe unauthenticated attacker in NetWeaver AS Java Logon application - version 7.50, can brute force the login functionality to identify the legitimate user ids. This will have an impact on confidentiality but there is no other impact on integrity or availability.
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 · high confidenceSAP NetWeaver AS Java version 7.50 contains an unauthenticated user enumeration vulnerability in its logon application. Attackers can leverage the login function to brute force and discover valid user IDs by observing different responses for valid versus invalid usernames, impacting confidentiality only.
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= 7.50CVSS 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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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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Identify SAP NetWeaver AS Java versionCheck the installed SAP NetWeaver Application Server Java version by accessing the SAP System Information page or running the SAPMMC version check for the Java stackAffected if The installed version is exactly 7.50 (the only affected version listed)
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Verify logon application is accessibleAccess the SAP NetWeaver logon page via browser at the standard URL path such as /irj/portal or the dedicated logon servlet endpointAffected if The logon interface is publicly or internally reachable without authentication
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Test for user enumeration response differencesSubmit login attempts with a known-valid username format versus a clearly invalid username and compare the HTTP response codes, error messages, or response timesAffected if The responses differ between valid and invalid usernames (e.g., different error messages, response codes, or timing that reveals whether the username exists)
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Review authentication logs for enumeration patternsExamine SAP NetWeaver security logs for repeated failed login attempts showing patterns of username probing with consistent response patterns for valid accountsAffected if Logs show differentiated responses that could enable an attacker to confirm valid usernames
Environment is affected if running SAP NetWeaver AS Java version 7.50 with the unauthenticated logon interface accessible, and the login function returns distinguishable responses for valid versus invalid usernames.
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.
dbcve · scopedImplement account lockout policies, rate limiting, or CAPTCHA on the logon interface to prevent automated enumeration; consider enabling multi-factor authentication for an additional security layer.
- 1. Access the SAP One Support Launchpad (launchpad.support.sap.com) and search for SAP Security Note related to CVE-2023-42480.
- 2. Apply the relevant SAP Security Note patch for the NetWeaver AS Java Logon brute force vulnerability.
- 3. After applying the patch, verify that account lockout policies are properly configured in the UM4 (User Management) component.
- 4. Confirm the login mechanism now properly restricts excessive authentication attempts.
- 5. Test the login functionality to ensure legitimate users can authenticate while brute force attempts are blocked.
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 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-2023-42480 — 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-2023-42480 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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