---
id: "CVE-2021-31201"
kind: "vulnerability"
aliases: ["CVE-2021-31201"]
title: "Microsoft Enhanced Cryptographic Provider: Microsoft Enhanced Cryptographic Provider Privilege Escalation Vulnerability"
severity: "high"
cvss: 7.8
epss: 0.02617
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Microsoft Enhanced Cryptographic Provider", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "self-hosted", "windows"]
not_affected_if: ["unpatched-fleets-not-in-scope"]
published_at: "2021-06-08T23:15:08+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-31201", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-31201", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-31201", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Microsoft Enhanced Cryptographic Provider: Microsoft Enhanced Cryptographic Provider Privilege Escalation Vulnerability

Microsoft Enhanced Cryptographic Provider, a Windows cryptographic component, contains an unspecified flaw that lets a local user escalate privileges. An attacker with a foothold on the machine can gain higher privileges, and CISA lists it as actively exploited.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft Enhanced Cryptographic Provider affected ? fixed ?

## Fix

Apply the Microsoft security update for CVE-2021-31201 per vendor instructions (CISA required action); the specific KB or patched build is not given in the sources.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-31201
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2021-31201
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-31201

## From the sources

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

CISA required action: Apply updates per vendor instructions.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_