---
id: "CVE-2021-22894"
kind: "vulnerability"
aliases: ["CVE-2021-22894"]
title: "Ivanti Pulse Connect Secure: Ivanti Pulse Connect Secure Collaboration Suite Buffer Overflow Vulnerability"
severity: "critical"
cvss: 9.0
epss: 0.41284
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Ivanti Pulse Connect Secure", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "ivanti", "pulse-connect-secure", "vendor", "vpn-appliance"]
not_affected_if: ["no-pulse-connect-secure"]
published_at: "2021-05-27T12:15:07+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-2021-22894", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-22894", "first_seen_at": "2026-10-23T19:13:43+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22894", "first_seen_at": "2026-10-23T21:57:34+00:00"}]
---

# Ivanti Pulse Connect Secure: Ivanti Pulse Connect Secure Collaboration Suite Buffer Overflow Vulnerability

Ivanti Pulse Connect Secure's Collaboration Suite has a buffer overflow in its meeting room handling. An authenticated user can send a crafted meeting room request and run code as root on the appliance.

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

## Affected

- vendor:Ivanti Pulse Connect Secure affected ? fixed ?

## How to check

Check the Pulse Connect Secure version against the vendor advisory; the sources do not give a command.

## Fix

Apply the Ivanti update for Pulse Connect Secure per the vendor's instructions; the sources do not name a fixed version.
CISA KEV required action: apply updates per vendor instructions.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-22894
- 2026-10-23T19:13:43+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2021-22894
- 2026-10-23T21:57:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-22894

## From the sources

Ivanti Pulse Connect Secure Collaboration Suite contains a buffer overflow vulnerabilities that allows a remote authenticated users to execute code as the root user via maliciously crafted meeting room.

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_