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

criticalknown exploitedCVE-2021-27852
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Deserialization of Untrusted Data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote attacker to execute arbitrary code.

CSIRTS triage

vendor: Checkboxproduct: SurveyRemote code executionUnsafe deserialization
What
Deserialization of Untrusted Data vulnerability in Checkbox Survey allows an unauthenticated remote attacker to execute arbitrary code.
Who is affected
Deployments of Checkbox Survey are affected.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Update to the latest version of Checkbox Survey.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-04-11
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-27852

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-27852coverage & exploitation statusNVD · CVE.org

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