CVE-2021-22893

Exp

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.

Published: 2021-04-23 Last update: 2025-12-18 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-22893 is rated Critical Active Threat (94.5/100): CVSS Critical severity, with high exploitation likelihood (EPSS 47.17%, 99th percentile). CISA KEV confirms active exploitation (added 2021-11-03) affecting Ivanti / Pulse Connect Secure. an authentication bypass (CWE-287) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2021-22893

Name: Ivanti Pulse Connect Secure Use-After-Free Vulnerability · CISA KEV detail

Exploit added: 2021-11-03

Action due: 2022-05-03

Required action: Apply updates per vendor instructions.

Exploit prediction scoring system (EPSS) score for CVE-2021-22893

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 93.61% 47.17% -46.43%
2 2026-05-24 93.97% 93.61% -0.36%
3 2026-05-22 — 93.97% —

Full EPSS history (29 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-22893

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 6.0 [email protected]
10.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 6.0 134c704f-9b21-4f2e-91b3-4a467353bcc0
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2021-22893

Affected software / configurations for CVE-2021-22893

Vendor Product Version Raw CPE
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:-:*:*:*:*:*:*
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:r1:*:*:*:*:*:*
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:r2:*:*:*:*:*:*
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:r2.1:*:*:*:*:*:*
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:r3:*:*:*:*:*:*
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:r3.1:*:*:*:*:*:*
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:r3.2:*:*:*:*:*:*
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:r3.3:*:*:*:*:*:*
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:r3.5:*:*:*:*:*:*
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:r4:*:*:*:*:*:*
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:r4.1:*:*:*:*:*:*
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:r5.0:*:*:*:*:*:*
ivanti connect_secure 9.0 cpe:2.3:a:ivanti:connect_secure:9.0:r6.0:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:-:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r1:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r10.0:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r10.2:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r11.0:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r11.1:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r11.3:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r2:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r3:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r4:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r4.1:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r4.2:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r4.3:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r5:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r6:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r7:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r8:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r8.1:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r8.2:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r8.4:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r9:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r9.1:*:*:*:*:*:*
ivanti connect_secure 9.1 cpe:2.3:a:ivanti:connect_secure:9.1:r9.2:*:*:*:*:*:*

References for CVE-2021-22893

cvelogic Threat Intelligence