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Exploited vulnerability · CISA KEV

Is CVE-2021-27852 exploited? Yes: in CISA KEV since 11 Apr 2022

Gociux · Checkbox Survey · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-27852, Checkbox Survey Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 11 Apr 2022, 319 days after it was published. It affects Checkbox Survey. If you run it, CISA's required action is: 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.

exploitedYesCISA KEV · 11 Apr 2022
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity9.8CVSS 3.1 · critical
US federal due2 May 2022BOD 22-01 deadline

What it is

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

VendorCheckbox (1 exploited CVE in KEV)
ProductCheckbox Survey
VulnerabilityCheckbox Survey Deserialization of Untrusted Data Vulnerability
WeaknessCWE-502
Published27 May 2021
Added to KEV11 Apr 2022
Reported by (CNA)certcc

What to do

  1. Check whether you run it. Look for Checkbox Survey in your asset inventory, including appliances and cloud images. Stack check lists every exploited Checkbox CVE at once.
  2. Apply the fix. 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.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 27 May 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for Checkbox.

References

Questions

Is CVE-2021-27852 being exploited?

Yes. CISA added CVE-2021-27852 to the Known Exploited Vulnerabilities catalog on 11 Apr 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-27852 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2021-27852?

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. Check Checkbox's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Checkbox Survey and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in April 2022 · act-now radar.

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