CVE-2021-27852Actively exploitedAdded to KEV 2022-04-11

Checkbox Survey Deserialization of Untrusted Data Vulnerability

Checkbox, Checkbox Survey

Description

Deserialization of Untrusted Data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote attacker to execute arbitrary code.

CVSS severity for this advisory hasn't been enriched from NVD yet, check back shortly.

EPSS, exploit probability

High

30.3%

estimated chance of real-world exploitation in the next 30 days, higher than 98.2% of every CVE FIRST.org scores

Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.

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.

CISA-recommended due date: 2022-05-02

CWE-502

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