CVE-2021-30175
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 · uneditedZEROF Web Server 1.0 (April 2021) allows SQL Injection via the /HandleEvent endpoint for the login page.
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 confidenceZEROF Web Server 1.0 contains a SQL Injection vulnerability in the /HandleEvent endpoint that handles login page requests. An unauthenticated attacker can inject malicious SQL commands through this endpoint to manipulate database queries, potentially allowing complete system compromise.
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= 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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 ZEROF Web Server versionLocate and verify the installed version of ZEROF Web Server by reviewing server banners, installed package metadata, or application documentation. Compare against version 1.0.Affected if The installed version is ZEROF Web Server 1.0 exactly
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Confirm /HandleEvent endpoint existsIdentify whether the /HandleEvent endpoint is present in the web server configuration or routing. This endpoint handles login page requests.Affected if The /HandleEvent endpoint exists and is accessible
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Determine if login functionality is enabledCheck whether the login feature that uses the /HandleEvent endpoint is actively enabled on the server.Affected if Login functionality via /HandleEvent is enabled and operational
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Inspect SQL query implementation in login handlerIf source code or configuration access is available, examine the /HandleEvent login handler to determine whether it constructs SQL queries dynamically using unsanitized user input rather than parameterized queries.Affected if The login handler uses dynamic SQL with user-supplied input without proper sanitization or parameterized queries
A system is affected if it runs ZEROF Web Server version 1.0 with the /HandleEvent endpoint enabled for login processing and the handler implements dynamic SQL queries using user input.
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 dataReplace dynamic SQL queries with parameterized queries or prepared statements in the /HandleEvent login handler, implement strict input validation, and apply principle of least privilege to the database account.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,408.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-30175 — 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-2021-30175 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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