CVE-2020-21639
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 · uneditedRuijie RG-UAC 6000-E50 commit 9071227 was discovered to contain a cross-site scripting (XSS) vulnerability via the rule_name parameter. This vulnerability allows attackers to execute arbitrary web scripts or HTML via a crafted payload.
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 confidenceRuijie RG-UAC 6000-E50 contains a reflected cross-site scripting (XSS) vulnerability in the rule_name parameter. Attackers can inject arbitrary JavaScript or HTML into the parameter, which is then executed in the victim's browser when the crafted payload is processed.
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 dataall versionsCVSS 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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Confirm Ruijie RG-UAC 6000-E50 is deployedIdentify the appliance or virtual instance in your environment. Check network documentation, asset inventory, or physically inspect the device for the Ruijie RG-UAC 6000-E50 model label.Affected if The device is a Ruijie RG-UAC 6000-E50 unit
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Check the firmware versionAccess the device web interface or CLI and locate the firmware version information. Typically found in System > About, System > Upgrade, or via CLI command 'show version'. Compare your installed version against 'all versions' of the RG-UAC 6000-E50 firmware.Affected if The device runs any firmware version of Ruijie RG-UAC 6000-E50 (all versions are affected)
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Verify the web management interface is accessibleConfirm the device HTTP/HTTPS management portal is reachable on the network. The XSS vulnerability exists in the web interface parameter.Affected if The web management interface is exposed and accessible
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Inspect access logs for malicious rule_name parametersReview web server logs, proxy logs, or WAF logs for requests containing suspicious patterns in the 'rule_name' parameter, such as <script>, javascript:, onerror=, or other HTML/JS injection vectors.Affected if Logs show requests with injected script tags or HTML in the rule_name parameter
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Check for signs of compromiseExamine the device for unauthorized configuration changes, new admin accounts, or unexpected network connections that may indicate successful XSS exploitation leading to session hijacking or further compromise.Affected if Unexpected changes exist that correlate with potential XSS exploitation
A user is affected if they have a Ruijie RG-UAC 6000-E50 device with any firmware version and the web management interface is accessible, as all versions contain the reflected XSS vulnerability in the rule_name parameter.
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 input validation and output encoding on the rule_name parameter to sanitize user-supplied data before rendering. Apply context-aware escaping based on where the input is displayed (HTML, JavaScript, or URL context).
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-21639 — 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-2020-21639 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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