{"cve":"CVE-2021-27852","nvd":{"published":"2021-05-27T21:15:20.567","modified":"2026-06-17T03:45:31.033","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-502"],"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"],"products":["checkbox:survey"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-27852","score":0.30258,"percentile":0.98223,"date":"2026-10-31"},"kev":{"cve":"CVE-2021-27852","date_added":"2022-04-11","due_date":"2022-05-02","vendor":"Checkbox","product":"Checkbox Survey","known_ransomware":false},"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}