CVE-2021-27852
Checkbox Survey Deserialization of Untrusted Data Vulnerability
IN CISA KEV
Deserialization of Untrusted Data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote attacker to execute arbitrary code.
- Vendor
- Checkbox
- Product
- Checkbox Survey
- CVSS
- No score recorded (no NVD record loaded for this entry)
- CWE
- CWE-502
- Published
- Not recorded
- NVD modified
- Not recorded
CISA KEV
- Date added
- 2022-04-11
- Due date
- 2022-05-02
- Ransomware use
- Unknown
- 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.
EPSS
30.3% chance of exploitation in the next 30 days (percentile 98th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.