CVE-2021-22893

highpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.472 · 99 %ileexploit · PoCEURUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 3 exploits · PoC

Likely / severe?

47.2% (99th) EPSS

CVSS 7.5 · high

Is it mine?

5 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

added 2021-11-03remediate by 2022-05-03

required action Apply updates per vendor instructions.

EPSS · scored 2026-10-27

Ivanti Pulse Connect Secure Use-After-Free Vulnerability

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.

cvss

Technical severity, 0–10. One row per scoring source.

10.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–10

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.110criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 6

v3.110criticalAV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.110criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · ENISA EU

v3.110criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondaryexploitability 3.9 · impact 6

v3.110criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-416USprimaryCWE-287USCWE-287US

ATT&CK techniques

ATT&CK techniques this enables or maps to.

exploits (3)

Public proof-of-concept and weaponised exploit code.

MRLEE123456/CVE-2021-22893Pulse Connect Secure RCE Vulnerability (CVE-2021-22893)PoC · poc_in_github
ZephrFish/CVE-2021-22893_HoneyPoC2DO NOT RUN THIS.PoC · poc_in_github
orangmuda/CVE-2021-22893Proof On Concept — Pulse Secure CVE-2021-22893PoC · poc_in_github

affected products (5)

Products and version ranges known to be affected.

n/a Pulse Connect Secure≤ PCS 9.0R3 or above, PCS 9.1R1 and aboveenisa_euvdEU
Pulsesecure Pulse Connect Secure≤ 9.1R1fstec_bduRU
Pulsesecure Pulse Connect Secure≤ 9.0R3fstec_bduRU
ivanti connect secure= 9.0nvdUScpe:2.3:a:ivanti:connect_secure:*:*:*:*:*:*:*:*
ivanti connect secure= 9.1nvdUScpe:2.3:a:ivanti:connect_secure:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2021-04-23modified 2026-08-12

related (12,235)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-109619US	high8.1OT critical	100.0% (100th)	KEV	2026-10-21
PHP has various global state that temporarily points into request memory. In some scenarios, global state may not be correctly reset, or may be repopulated after being reset. The g…
CVE-2026-109618US	critical9.8OT critical	100.0% (100th)	KEV	2026-10-21
PHP uses longjmp() for out-of-memory (OOM) errors to exit the current context and abort handling of the request. Some contexts may not properly account for this scenario and leave…
CVE-2026-68820US	—OT critical	0.33% (26th)	KEV	2026-08-11
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVE-2026-5281US	—OT critical	13.5% (96th)	KEV	2026-04-01
Use after free in Dawn in Google Chrome prior to 146.0.7680.178 allowed a remote attacker who had compromised the renderer process to execute arbitrary code via a crafted HTML page…
CVE-2026-2441US	high8.8OT critical	55.0% (99th)	KEV	2026-02-13
Use after free in CSS in Google Chrome prior to 145.0.7632.75 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security sever…

+12230 more

references (18)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan