---
id: "CVE-2021-22893"
kind: "vulnerability"
aliases: ["CVE-2021-22893"]
title: "Ivanti Pulse Connect Secure: Ivanti Pulse Connect Secure Use-After-Free Vulnerability"
severity: "critical"
cvss: 10.0
epss: 0.47172
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Ivanti Pulse Connect Secure", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "ivanti", "pulse-connect-secure", "ransomware", "vendor", "vpn"]
not_affected_if: ["unknown"]
published_at: "2021-04-23T17:15:08+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:34+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-22893", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-22893", "first_seen_at": "2026-10-23T19:13:43+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22893", "first_seen_at": "2026-10-23T21:57:34+00:00"}]
---

# Ivanti Pulse Connect Secure: Ivanti Pulse Connect Secure Use-After-Free Vulnerability

Ivanti Pulse Connect Secure has a use-after-free bug in its license services that lets a remote, unauthenticated attacker run code on the appliance. CISA lists it as actively exploited, and the sources tie it to ransomware campaigns.

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

## Affected

- vendor:Ivanti Pulse Connect Secure affected ? fixed ?

## Fix

Apply the updates per the vendor instructions (sources do not name the fixed version).

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-22893
- 2026-10-23T19:13:43+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2021-22893
- 2026-10-23T21:57:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-22893

## From the sources

Pulse Connect Secure 9.0R3/9.1R1 and higher is vulnerable to an authentication bypass vulnerability exposed by the Windows File Share Browser and Pulse Secure Collaboration features of Pulse Connect Secure that can allow an unauthenticated user to perform remote arbitrary code execution on the Pulse Connect Secure gateway. This vulnerability has been exploited in the wild.

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