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Known exploited vulnerability

CVE-2021-27852

criticalCVSS 3.1 9.8In CISA KEVEPSS 30%Published · Checkbox

The short answer

CVE-2021-27852 affects Checkbox Survey and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-04-11: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-502.

Severity

9.8 critical

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

Exploited (CISA KEV)

Yes, since Apr 11, 2022

Federal due date May 2, 2022

EPSS, next 30 days

30%

Higher than 98% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

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.

Affected products

Survey. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2021-27852 being exploited?

Yes. CISA added CVE-2021-27852 to its Known Exploited Vulnerabilities catalog on 2022-04-11, with a federal remediation due date of 2022-05-02.

How do I fix CVE-2021-27852?

CISA's 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.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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