5.2

CVE-2021-31199: Microsoft Enhanced Cryptographic Provider Privilege Escalation Vulnerability

CVSS: 5.2v3.1MediumKEVAnalyzed
Published 08-06-2021Last modified 21-10-2025
Open JSON

Vulnerability summary

CVE-2021-31199 is a medium (CVSS 5.2) vulnerability in Microsoft Enhanced Cryptographic Provider. It is known to be exploited: CISA lists it, first on 03-11-2021. EPSS estimates a 2.95% chance of exploitation in the next 30 days, higher than 86.9% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
5.2/10
010
Medium · v3.1 (CVE.org)
EPSS score
2.95%
0%100%
Low · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-06-2021
    PublishedVulnerability first disclosed.
  2. 03-11-2021
    Added to CISA KEVMicrosoft Enhanced Cryptographic Provider Privilege Escalation Vulnerability
  3. 17-11-2021
    CISA remediation dueApply updates per vendor instructions.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

Description

Microsoft Enhanced Cryptographic Provider Elevation of Privilege Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

2.95%

Chance of exploitation in the next 30 days

Percentile

87%

Versus all other CVEs

30-day change

0.00 pp

From 2.95% on 19-09-2026

19-09-202619-10-2026
EPSS score
2.95%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
03-11-2021
Federal due date
17-11-2021

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2021-31199

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Microsoft36 products

1 vendor · 36 products

References

2 links