{"id":"CVE-2021-27852","aliases":[],"url":"https://o3.security/vulnerability/CVE-2021-27852","summary":"Deserialization of Untrusted Data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote attacker to execute arbitrary code. This issue affects: Checkbox…","details":"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.","published":"2021-05-27T21:15:20.567","modified":"2026-06-17T03:45:31.033","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.31946,"percentile":0.98168,"asOf":"2026-08-24"},"cisaKev":{"dateAdded":"2022-04-11","dueDate":"2022-05-02","knownRansomwareCampaignUse":false},"exploitsKnown":2,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://www.kb.cert.org/vuls/id/706695"},{"type":"ADVISORY","url":"https://www.kb.cert.org/vuls/id/706695"},{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27852"}],"provenance":{"sources":["OSV.dev","NVD","CISA KEV","FIRST.org (EPSS)"],"lastVerified":"2026-06-17T03:45:31.033"}}