CVE-2023-45227
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 · uneditedAn attacker with access to the web application with vulnerable software could introduce arbitrary JavaScript by injecting a cross-site scripting payload into the "dns.0.server" parameter.
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 confidenceReflected cross-site scripting (XSS) vulnerability in the 'dns.0.server' parameter of a web application. An authenticated attacker can inject arbitrary JavaScript that executes in the context of other users' browsers when the malicious input is reflected back without proper sanitization or encoding.
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= 4.24CVSS 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
- 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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Confirm firmware versionAccess the device's web interface or CLI and locate the firmware version information. This is typically found in System > Status or through a 'show version' command in the CLI.Affected if Firmware version is exactly 4.24
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Verify web management interface is enabledConfirm that the HTTP/HTTPS web management interface is accessible by navigating to the device's IP address in a browser.Affected if Web interface is enabled and reachable
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Access DNS server configurationNavigate to the DNS configuration section in the web UI (usually under Network or System settings) and locate the dns.0.server parameter field.Affected if DNS server configuration page with dns.0.server parameter is accessible
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Inspect parameter for input reflectionView the HTML source or page response when the dns.0.server value is submitted and reflected back. Check if the value appears without proper encoding or sanitization in the rendered HTML.Affected if The dns.0.server value is reflected in the response without visible context-aware encoding
The environment is affected if running Westermo L206 F2g Firmware version 4.24 with the web interface enabled and the DNS server configuration feature accessible, as the dns.0.server parameter reflects user input without sanitization.
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 context-sensitive output encoding for the dns.0.server parameter and validate/sanitize all user inputs. Deploy Content Security Policy (CSP) headers to mitigate XSS execution. Consider implementing input validation allowlists for the DNS server field.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-45227 — 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-2023-45227 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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