CRITICAL CISA KEV
CVE-2021-31166
CVSS v3
9.8
CRITICAL
EPSS Score
93.1 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
Description
HTTP Protocol Stack Remote Code Execution Vulnerability
CISA Known Exploited Vulnerability
- Date Added
- 2022-04-06
- Patch Due Date
- 2022-04-27
- Ransomware Use
- Unknown
Technical details
- Published
- 2021-05-11
Frequently asked questions
What is CVE-2021-31166?
HTTP Protocol Stack Remote Code Execution Vulnerability
Is CVE-2021-31166 actively exploited?
Yes. CVE-2021-31166 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-04-27.
What is the CVSS score for CVE-2021-31166?
CVE-2021-31166 has a CVSS v3 base score of 9.8 (CRITICAL severity).
Is CVE-2021-31166 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.
No credit card required · 500 free checks/month · Free API key
Other 2021 vulnerabilities worth triaging
Ranked by exploit probability (EPSS).