CVE-2021-27852CISA KEVEPSS p98.1%

CVE-2021-27852Checkbox 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.

Scoring

EPSS31.95% probability of exploitation · percentile 98.1% · 2026-06-18T12:00:27Z

CISA KEV entry

Added to KEV: 2022-04-11

(incoming)1

TypeTargetConfidenceTier
KEVEntryCheckbox Survey Deserialization of Untrusted Data Vulnerabilitykev-cve-2021-278520%live

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Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.