CVE Tools
Sign in

CVE-2021-22894

Published: May 27, 2021Updated: Dec 18, 2025 Sources: CVE List NVD BDUCWE-94
NVD MITRE
8.8CVSSHIGH
EPSS Score
41.3%
Top 1.5%
CISA KEV
Active Exploitation
Since Nov 3, 2021
Exploits
No Known Exploits
Remediation
Patch Available

Description

A buffer overflow vulnerability exists in Pulse Connect Secure before 9.1R11.4 allows a remote authenticated attacker to execute arbitrary code as the root user via maliciously crafted meeting room.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-94CWE-119

Affected Products

Pulse Connect SecurePulsesecure
On-premNetwork Device
Networking Infrastructure / vpn-gateway
Pulse Connect Securen/a
connect secureivantiSecurity Products
pulsesecurecommercialUSNetworking Infrastructureaka pulsedsecure, pulse secure
ivanticommercialUSSecurity Productsaka ivanti connect secure, avalanche

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Nov 3, 2021
Remediation due:May 3, 2022

Required action: Apply updates per vendor instructions.

Official Patch Available

MITRE ATT&CK

3 techniques
Execution
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://nvd.nist.gov/vuln/detail/CVE-2021-22894
nvd.nist.gov
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/?kA23Z000000boUWSAY
kb.pulsesecure.net
https://www.cisa.gov/sites/default/files/csv/known_exploited_vulnerabilities.csv
cisa.gov
and 1 more references View all →

Timeline

Published
May 27, 2021
Added to CISA KEV
Nov 3, 2021
Last Updated
Dec 18, 2025

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2021-22894 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows