CVE-2021-27852Deserialization of Untrusted Data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote attacker to execute arbitrary code.
Updated under an hour ago ()
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It affects Checkbox Survey. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Apr 11, 2022; federal agencies had to remediate by May 2, 2022. Treat that date as your deadline.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-502
- Known exploited
- Added to CISA KEV Apr 11, 2022; federal remediation due May 2, 2022Versions 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 (exploitation in the next 30 days)
- 30.26% (percentile 98)
- Assigned by
- certcc
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Checkbox Survey checkbox:survey (from the name) | from unspecified before 7 | CNA record |
checkbox survey checkbox:survey | before 7.0 | NVD |
References
- https://www.kb.cert.org/vuls/id/706695third-party-advisory, us-government-resource
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27852us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.