CVE-2021-27852
KEVCheckbox Survey Deserialization of Untrusted Data Vulnerability
Description
Deserialization of Untrusted Data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote attacker to execute arbitrary code.
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 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HPublishedMay 27, 2021
Last modifiedJun 17, 2026
Added to KEVApr 11, 2022
Remediation dueMay 2, 2022
References
- kb.cert.org/vuls/id/706695Third Party AdvisoryUS Government Resource
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27852US Government Resource
0 recent articles mention this CVE
82
Risk assessment · Critical
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1639 days
- CVSS
- 9.8 CRITICAL
- EPSS (30-day exploit probability)
- 30.3% · top 2% of all CVEs
- Weakness
- CWE-502
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.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.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.