Ivanti · Pulse Connect Secure

CVE-2021-22894

Ivanti Pulse Connect Secure Collaboration Suite Buffer Overflow Vulnerability

Exploited in attacks High 8.8 Attack chance: 41%

What it is

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.

CISA: 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.

What to do

Apply updates per vendor instructions.

Deadline for US federal agencies: May 3, 2022

Added to the CISA list: November 3, 2021
Published: May 27, 2021
Severity: High 8.8 CVSS 3.1
Chance of attacks in the next 30 days (EPSS): 41% in the top 1.3% of all known vulnerabilities
Weakness: CWE-94
More details: NVD · CVE.org · CISA

All references (1)

https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/?kA23Z000000boUWSAY

More exploited flaws from Ivanti

Added	Vulnerability	Product	Severity	Attack chance
Nov 3, 2021	Code ExecutionCVE-2020-8243	Pulse Connect Secure	High 7.2	91%
Nov 3, 2021	Code ExecutionCVE-2020-8260	Pulse Connect Secure	High 7.2	96%
Nov 3, 2021	Arbitrary File ReadCVE-2019-11510used by ransomware	Pulse Connect Secure	Critical 9.9	>99.9%
Nov 3, 2021	Use-After-FreeCVE-2021-22893used by ransomware	Pulse Connect Secure	Critical 10.0	47%
Nov 3, 2021	Command InjectionCVE-2021-22899	Pulse Connect Secure	High 8.8	23%
Nov 3, 2021	Unrestricted File UploadCVE-2021-22900	Pulse Connect Secure	High 7.2	14%
Oct 13, 2026	Authentication Bypass by SpoofingCVE-2026-104935	Connect Secure	High 8.6	87%
Jun 11, 2026	OS Command InjectionCVE-2026-10520	Sentry	Critical 10.0	99.9%

All of them →

Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.