What is the CVSS score of CVE-2020-37071?

CVE-2020-37071 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.5%.

Which versions of PHP are affected by CVE-2020-37071?

CraftCMS 3 installations using the vCard Plugin 1.0.0 are vulnerable to unauthenticated remote code execution, allowing attackers to gain complete control of affected web servers without requiring…

Is there a public PoC exploit available for CVE-2020-37071?

Yes, a public proof-of-concept exploit is available for CVE-2020-37071. Prioritise patching immediately. EPSS: 0.5%.

How to fix or mitigate CVE-2020-37071?

Within 24 hours: Identify all CraftCMS 3 instances using vCard Plugin 1.0.0 and disable the plugin or remove it entirely; implement WAF rules to block deserialization payloads targeting the plugin. Within 7 days: If the plugin cannot be removed, implement network segmentation to restrict access to affected systems and deploy intrusion detection signatures for CVE-2020-37071 exploitation attempts. Within 30 days: Contact the plugin vendor for patch availability; if no patch is released, evaluate alternative vCard solutions or migrate to a patched CMS version.

PHP CVE-2020-37071

CRITICAL

Deserialization of Untrusted Data (CWE-502)

2026-02-03 disclosure@vulncheck.com

PHP RCE Deserialization

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 04, 2026 - 16:33 vuln.today

Public exploit code

CVE Published

Feb 03, 2026 - 22:16 nvd

CRITICAL 9.8

DescriptionCVE.org

CraftCMS 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.

AnalysisAI

CraftCMS 3 vCard Plugin 1.0.0 has an insecure deserialization vulnerability allowing unauthenticated remote code execution through crafted vCard data.

Technical ContextAI

The vCard Plugin 1.0.0 for CraftCMS 3 deserializes untrusted data (CWE-502) from vCard imports, allowing attackers to inject serialized PHP objects that execute arbitrary code.