Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-27852

CVE-2021-27852CRITICAL

Checkbox Checkbox Survey

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  H  H    9.8   .3026   98.2   YES

AFFECTED
  Product  Versions       Fixed
  Survey   unspecified –  —

TIMELINE
  Mar 1   Reserved by certcc
  May 27  Published (CNA: certcc)
  Apr 11  Added to CISA KEV, remediation due 2022-05-02

CWE-502 · CNA: certcc · CVSS v3.1 · 2 references · KEV due May 2, 2022

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
March 1, 2021	Reserved	Reserved by certcc
May 27, 2021	Published	Published (CNA: certcc)
April 11, 2022	KEV ADDED	Added to CISA KEV, remediation due 2022-05-02

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Checkbox	Survey	—	unspecified	—

Weaknesses

CWE-502

References (2)

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

Authoritative record: CVE-2021-27852 at cve.org

Vendors: checkbox

Weaknesses: CWE-502

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-27852 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, October 7, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.