CVE-2020-37071
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 · uneditedCraftCMS 3 vCard Plugin 1.0.0 contains a deserialization vulnerability that allows unauthenticated attackers to execute arbitrary PHP code through a crafted payload. Attackers can generate a malicious serialized payload that triggers remote code execution by exploiting the plugin's vCard download functionality with a specially crafted 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 confidenceThe vCard plugin for CraftCMS 3 versions 1.0.0 and earlier contains an unsafe deserialization vulnerability in its download functionality. Attackers can send a crafted serialized PHP object that, when deserialized by the application, triggers remote code execution without authentication.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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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Verify vCard plugin installationCheck if the vCard plugin is present in your CraftCMS 3 installation by reviewing the plugins configuration file or vendor directory for the vCard plugin componentsAffected if The vCard plugin is installed on the CraftCMS 3 instance
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Identify the installed vCard plugin versionLocate the plugin's version manifest or composer.json file within the vCard plugin directory and compare the version number to 1.0.0Affected if The vCard plugin version is exactly 1.0.0 or falls within the vulnerable release range
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Confirm vCard download feature accessibilityTest access to the vCard download endpoint or functionality provided by the plugin without authenticationAffected if The vCard download endpoint is reachable without authentication and processes user-supplied input
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Review server access logs for suspicious unserialize patternsSearch web server logs for requests to vCard-related endpoints containing serialized PHP object patterns or unusual payload signaturesAffected if Log analysis reveals serialized PHP data or known exploitation patterns sent to vCard endpoints
You are affected if the CraftCMS 3 vCard plugin version 1.0.0 is installed and its download functionality is accessible, as this combination enables unauthenticated deserialization exploitation.
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 dataUpdate the vCard plugin to a patched version if available, or remove/disable the plugin entirely. Implement a WAF rule to block serialized object payloads until a fix is applied.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-37071 — 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-2020-37071 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
- No spam, self-promotion, credentials, or personal data