How severe is CVE-2021-27852?

CVE-2021-27852 has a CVSS 3.1 base score of 9.8 (CRITICAL). EPSS estimates a 30.3% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

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

CISA Known Exploited Vulnerabilities

Checkbox Survey Deserialization of Untrusted Data Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2022-04-11

Remediation due

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.

CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2021-27852

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.

Severity

CVSS 3.1 · CNA9.8 CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC · CISA-ADP

Exploitationactive

Automatableyes

Technical impacttotal

Affected Products

Vendor	Product	Affected versions
Checkbox	Survey	unspecified to <7

References

1 Links

Other references

https://www.kb.cert.org/vuls/id/706695

Record Details

Published

2021-05-27

Last updated

2025-10-21

Assigner (CNA)

certcc

Credited to

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.