CVE-2020-13820
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 · uneditedExtreme Management Center 8.4.1.24 allows unauthenticated reflected XSS via a parameter in a GET request.
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 confidenceExtreme Management Center 8.4.1.24 contains an unauthenticated reflected XSS vulnerability where malicious JavaScript can be injected through a parameter in a GET request. When a victim clicks a crafted link, the attacker's script executes in the context of the victim's session.
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= 8.4.1.24CVSS 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
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/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 the Extreme Management Center versionLog into the Extreme Management Center web interface and navigate to the Administration > Settings > General page, or check the version via the Help > About menu in the client application. Alternatively, check the installation directory or use the command line tool 'xcmpower' with the version flag if available.Affected if The installed version is exactly 8.4.1.24
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Confirm the web interface is accessibleAttempt to access the Extreme Management Center login page via HTTP/HTTPS in a web browser using the configured hostname or IP address.Affected if The web interface is reachable and responds to requests
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Test for reflected parameters in GET requestsReview the application for any GET endpoints that reflect user-supplied parameters in the response. Since the specific vulnerable parameter is not identified in the CVE, manually test common parameter names (such as 'msg', 'id', 'name', 'error', 'redirect') appended with a benign test string like '<script>alert(1)</script>' to observe if the input is reflected without encoding.Affected if Any parameter in a GET request reflects the user input back into the HTML response without encoding, indicating potential XSS vulnerability
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Review web server logs for XSS patternsExamine the Extreme Management Center web server logs (typically located in the installation logs directory) for GET requests containing suspicious patterns such as '<script>', 'javascript:', or other HTML/script tags in URL parameters.Affected if Logs show unauthenticated GET requests with script tags or XSS payloads targeting the application
If the installed version of Extreme Management Center is exactly 8.4.1.24 and the web interface reflects user-supplied GET parameters without proper encoding, the environment is affected by this CVE.
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 proper input validation and output encoding for all user-supplied parameters in GET requests. Alternatively, apply any available vendor patches for this vulnerability.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2020-13820 — 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-2020-13820 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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