VULNERABILITY INTELLIGENCE

CVE-2021-27852

CVSS score9.8 CRITICAL

EPSS probability30.26%

CISA KEVKnown exploited vulnerability

Published2021-05-27

Last modified2026-06-17

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

Known Exploited Vulnerability

Checkbox Survey Deserialization of Untrusted Data Vulnerability

Vendor / product: Checkbox / Checkbox Survey

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.

Weakness classification

CWE-502: Deserialization of Untrusted Data

Primary references

cret@cert.org — Third Party Advisory, US Government Resource
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, US Government Resource
134c704f-9b21-4f2e-91b3-4a467353bcc0 — US Government Resource