{"schema":"threatline.record/2","record":{"id":"CVE-2021-27852","aliases":[],"summary":"Checkbox Survey Deserialization of Untrusted Data Vulnerability","details":"Deserialization of Untrusted Data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote attacker to execute arbitrary code.","categories":["Unclassified"],"product":"Checkbox Survey","vendor":"Checkbox","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-27852","source_modified_at":"2025-10-21T23:25:44.136Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Survey","vendor":"Checkbox","versions":[{"version":"unspecified","status":"affected","lessThan":"7","versionType":"custom"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-27852","source_modified_at":"2025-10-21T23:25:44.136Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Survey","ecosystem":null},"version":"7","basis":"first unaffected version stated in the CVE record"}],"cvss":9.8,"severity":"Critical","kev":{"listed":true,"date_added":"2022-04-11","due_date":"2022-05-02","required_action":"Versions 6 and earlier for this product are end-of-life and must be removed from agency networks. Versions 7 and later are not considered vulnerable.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.30258,"percentile":0.98226,"score_date":"2026-10-23"},"published_at":"2021-05-27T20:55:11.000Z","modified_at":"2025-10-21T23:25:44.136Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2021-27852","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:25:44.136Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-27852","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","EPSS"],"references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27852","source":"CISA KEV"},{"source":"CVE List","url":"https://www.kb.cert.org/vuls/id/706695","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27852","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"yes","technical_impact":"total","assessed_at":"2025-02-06T19:47:57.660138Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2025-10-21T23:25:44.136Z","content_hash":"f829c80e60c482b0a84b58cf6f977786e32e1f106a01eb8aba88d9bfe64a48d3"}}