CVE-2021-27852

9.8 criticalKEVEPSS 30%

Critical (9.8) in Checkbox Checkbox Survey. In CISA KEV since 2022-04-11. EPSS 30% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 30% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-31)
CISA KEV: listed 2022-04-11, due 2022-05-02
CWE: CWE-502
Published: 2021-05-27
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

checkbox:survey

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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