Exploited vulnerability · CISA KEV

Is CVE-2021-31199 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Microsoft Enhanced Cryptographic Provider · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-31199, Microsoft Enhanced Cryptographic Provider Privilege Escalation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 148 days after it was published. It affects Microsoft Enhanced Cryptographic Provider. If you run it, CISA's required action is: Apply updates per vendor instructions.

What it is

Microsoft Enhanced Cryptographic Provider contains an unspecified vulnerability that allows for privilege escalation.

What to do

1. Check whether you run it. Look for Enhanced Cryptographic Provider in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
2. Apply the fix. Apply updates per vendor instructions.
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 8 Jun 2021.
4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Enhanced Cryptographic Provider

• CVE-2021-31201: Microsoft Enhanced Cryptographic Provider Privilege Escalation Vulnerability (3 Nov 2021)

References

• nvd.nist.gov/vuln/detail/CVE-2021-31199

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 November 2021 · Microsoft scorecard · act-now radar.