CVE-2021-20336
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 Tivoli Netcool/OMNIbus_GUI 8.1.0 is vulnerable to stored cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session.
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 Tivoli Netcool/OMNIbus_GUI 8.1.0 contains a stored cross-site scripting (XSS) vulnerability where authenticated users can embed arbitrary JavaScript code into the Web UI. This malicious script is persisted and executes in the browsers of other users viewing the affected interface, potentially allowing attackers to steal session credentials or perform actions within trusted sessions.
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= 8.1.0CVSS 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
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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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Identify IBM Tivoli Netcool/OMNIbus WebGUI installationLocate the installation directory and check the version file, or run: `npmi version` or check the About section in the WebGUI console if accessible. Common paths include /opt/IBM/tip or installation-specific directories.Affected if The installed version is exactly 8.1.0
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Confirm WebGUI component is enabledCheck if the WebGUI component is running and accessible by accessing the web interface URL (typically port 16311 or 80/443). Verify the service is active via process status or service manager.Affected if WebGUI is accessible and running, and the version is 8.1.0
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Verify authentication is configuredCheck the security configuration files (such as tipsec.xml or security.xml in the configuration directory) to confirm user authentication is enabled for the WebUI.Affected if Authentication is enabled (which is required for this exploit since it is an authenticated user XSS)
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Inspect user input fields for lack of sanitizationReview the WebGUI configuration files and any custom probes or scripts that handle user input in the Web UI. Check if output encoding is implemented in the JSP files or middleware.Affected if User input in Web UI forms is not validated or encoded, allowing script injection
A defender is affected if IBM Tivoli Netcool/OMNIbus WebGUI version 8.1.0 is running with the WebUI component accessible and user authentication enabled.
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 dataImplement robust input validation and output encoding for all user-supplied data in the Web UI, apply contextual escaping, and consider implementing Content Security Policy (CSP) headers. Review and apply any vendor security patches for this vulnerability.
- Consultation12.0 h
- Implementation24.0 h
- Testing16.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $16,896.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-20336 — 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-2021-20336 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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