# CVE-2021-27852: Checkbox Survey Deserialization of Untrusted Data Vulnerability

Source: https://junglewise.ai/threats/cve-2021-27852-checkbox-survey-deserialization-of-untrusted-data-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-04-11. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-27852 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2022-04-11

A deserialization of untrusted data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote attacker to execute arbitrary code. The issue affects versions prior to 7, which are considered end-of-life.

## Quick answers

**Is CVE-2021-27852 exploited in the wild?** Yes. CVE-2021-27852 is known to be exploited in the wild, first recorded on 11 April 2022. Treat it as urgent.

**How severe is CVE-2021-27852?** Critical severity, with a CVSS score of 9.8, published 11 April 2022.

**Which products and versions are affected?** Checkbox Survey versions prior to 7.

**Is there a fix for CVE-2021-27852?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2021-27852 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2021-27852?** Check whether you run Checkbox Survey. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Checkbox Survey versions prior to 7

## Timeline

- 2021-05-27: disclosed: NVD Published Date
- 2022-04-11: kev added: Added to CISA Known Exploited Vulnerabilities Catalog