What is the CVSS score of CVE-2021-22900?

CVE-2021-22900 has a CVSS 3.1 base score of 7.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 14.1%.

Is CVE-2021-22900 being actively exploited?

Yes, CVE-2021-22900 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active in-the-wild exploitation. Immediate patching is required.

Pulse Connect Secure CVE-2021-22900

HIGH

Code Injection (CWE-94)

2021-05-27 support@hackerone.com

RCE Code Injection Ivanti Connect Secure Pulse Connect Secure Pulsesecure

7.2

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-94 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization Code injection prevention, sandbox exec MITRE ATT&CK 2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 7.2 (HIGH). Attack characteristics: network attack vector, low complexity, high privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could inject and execute arbitrary code within the application by sending crafted requests to the affected application.

This Week Schedule remediation this week. Why: HIGH severity + EPSS > 10%.

Exploited in the wild (CISA KEV) No patch listed yet 14.1% exploitation probability (EPSS)

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AnalysisAI

A vulnerability allowed multiple unrestricted uploads in Pulse Connect Secure before 9.1R11.4 that could lead to an authenticated administrator to perform a file write via a maliciously crafted. Rated high severity (CVSS 7.2), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Never evaluate user-controlled input as code. Use sandboxing, disable dangerous functions, apply strict input validation.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Code Injection (CWE-94), which allows attackers to inject and execute arbitrary code within the application. A vulnerability allowed multiple unrestricted uploads in Pulse Connect Secure before 9.1R11.4 that could lead to an authenticated administrator to perform a file write via a maliciously crafted archive upload in the administrator web interface. Affected products include: Ivanti Connect Secure, Pulsesecure Pulse Connect Secure. Version information: before 9.1.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.2 HIGH

AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

May 27, 2021 - 12:15 nvd

HIGH 7.2

DescriptionNVD

A vulnerability allowed multiple unrestricted uploads in Pulse Connect Secure before 9.1R11.4 that could lead to an authenticated administrator to perform a file write via a maliciously crafted archive upload in the administrator web interface.

Threat Intelligence Overview

EPSS Score

14.1%

Top 4% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

CISA KEV

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV Yes

Public POC No

EPSS 14.1%

Patch available No

Active threat Yes

Deciding rule

HIGH severity + EPSS > 10%

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Active

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

High

Priority Score

100

Low Medium High Critical

KEV: +50

EPSS: +14

CVSS: +36

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Code Injection CRITICAL

Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)NVD

cpe:2.3:a:ivanti:connect_secure:9.0:-:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r1:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r1.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r2:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r2.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r2.1:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r3:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r3.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r3.1:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r3.2:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r3.3:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r3.5:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r4:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r4.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r4.1:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r5.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.0:r6.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.1:-:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.1:r1:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.1:r10.0:*:*:*:*:*:*

+ 21 more

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References

Advisories & patches

ADVISORY https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/?kA23Z000000boUWSAY REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22900

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