CVE-2021-27852

criticalknown exploitedcovered by 1 sourcefirst seen 2022-04-11

Actively exploited. CVE-2021-27852 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-11) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.

Deserialization of Untrusted Data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote attacker to execute arbitrary code.

CSIRTS triage

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.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 98% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalexploitedCVE-2021-27852: Checkbox Survey Deserialization of Untrusted Data Vulnerabilitycisa-kev · 2022-04-11

External references

NVD record for CVE-2021-27852

CVE.org record

CISA KEV catalog

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