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CVE-2021-27852

CRITICAL9.8
CISA KEV

Published 2021-05-27 · Updated 2026-06-17 · Source cret@cert.org

Summary

CVE-2021-27852 is a critical-severity (CVSS 9.8) vulnerability in Checkbox Checkbox Survey. CISA added it to the Known Exploited Vulnerabilities catalog on April 11, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 2, 2022. CISA does not currently list it as used in ransomware campaigns.

All 1 known-exploited Checkbox vulnerabilities →

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.

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

CWE-502CWE-502

CISA Known-Exploited Vulnerability

Product: Checkbox — Checkbox Survey

Name: Checkbox Survey Deserialization of Untrusted Data Vulnerability

Date added: 2022-04-11 · Due: 2022-05-02

Required action: Versions 6 and earlier for this product are end-of-life and must be removed from agency networks. Versions 7 and later are not considered vulnerable.

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