What’s Vulnerable › Vulnerabilities

CVE-2021-27852: Checkbox Survey Deserialization of Untrusted Data Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2022-04-11
• EPSS: 30.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-27 · updated 2026-06-17
• Weakness: CWE-502

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.

Affected products

• Checkbox Survey: before 7.0 — fixed in 7.0

How to fix

Upgrade to a fixed version: Checkbox Survey 7.0. Check the vendor advisory for mitigations.

References

• https://www.kb.cert.org/vuls/id/706695
• https://www.kb.cert.org/vuls/id/706695
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27852

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