CVE-2021-42945
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 · uneditedA SQL Injection vulnerability exists in ZZCMS 2021 via the askbigclassid parameter in /admin/ask.php.
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 · high confidenceA SQL Injection vulnerability in ZZCMS 2021 allows attackers to inject arbitrary SQL commands through the askbigclassid parameter in /admin/ask.php. This critical flaw (CVSS 9.8) can be exploited remotely without authentication, potentially enabling complete database compromise including data exfiltration and manipulation.
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= 2021CVSS 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 ZZCMS installationSearch the web root directory for ZZCMS installation files and determine the installed version by locating version files or checking the main page for version informationAffected if ZZCMS version 2021 is found installed
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Locate vulnerable scriptCheck if the file /admin/ask.php exists in the web root directoryAffected if The file /admin/ask.php exists in the ZZCMS installation
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Verify parameter accessibilityReview the source code of /admin/ask.php to confirm the askbigclassid parameter is processed without proper input sanitization or parameterized queriesAffected if The askbigclassid parameter is handled without prepared statements or input validation
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Confirm unauthenticated accessVerify whether the /admin/ask.php endpoint is accessible without authentication by checking the application's access control configurationAffected if The ask.php script can be accessed without authentication
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Check for exploitation indicatorsReview web server access logs for unusual or suspicious requests containing SQL injection patterns in the askbigclassid parameterAffected if Log analysis reveals SQL injection attempts or successful exploitation of the askbigclassid parameter
A user is affected if ZZCMS version 2021 is installed and the /admin/ask.php script with the vulnerable askbigclassid parameter is accessible without authentication.
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 dataUpgrade ZZCMS to a patched version or implement parameterized queries/prepared statements for the askbigclassid parameter. Apply least-privilege database accounts and input validation as defense-in-depth while awaiting vendor patch.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-42945 — 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-2021-42945 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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