CVE-2021-27852

9.8 CRITICAL CISA KEV - Actively Exploited

Published: May 27, 2021 Modified: October 24, 2025

Description

Deserialization of Untrusted Data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote attacker to execute arbitrary code. This issue affects: Checkbox Survey versions prior to 7.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://www.kb.cert.org/vuls/id/706695

Source: cret@cert.org

Third Party Advisory US Government Resource

https://www.kb.cert.org/vuls/id/706695

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory US Government Resource

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27852

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

3 reference(s) from NVD

Quick Stats

CVSS v3 Score

9.8 / 10.0

EPSS (Exploit Probability)

31.8%

97th percentile

Exploitation Status

Actively Exploited

Remediation due: 2022-05-02

Weaknesses (CWE)

CWE-502 CWE-502

Affected Vendors

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