What is the CVSS score of CVE-2021-22934?

CVE-2021-22934 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: 4.7%.

Pulse Connect Secure CVE-2021-22934

HIGH

Classic Buffer Overflow (CWE-120)

2021-08-16 support@hackerone.com

Buffer Overflow Ivanti Connect Secure Pulse Connect Secure Pulsesecure

7.2

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-120 ASVS 5.0 V15 - Secure Coding and Architecture Buffer copy size validation MITRE ATT&CK 1 technique across 1 tactic: Execution 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 overflow a buffer to corrupt adjacent memory by sending crafted requests to the affected application.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 4.7% exploitation probability (EPSS)

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AnalysisAI

A vulnerability in Pulse Connect Secure before 9.1R12 could allow an authenticated administrator or compromised Pulse Connect Secure device in a load-balanced configuration to perform a buffer. 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. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.

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 Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. A vulnerability in Pulse Connect Secure before 9.1R12 could allow an authenticated administrator or compromised Pulse Connect Secure device in a load-balanced configuration to perform a buffer overflow via a malicious crafted web request. 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

DescriptionNVD

Threat Intelligence Overview

EPSS Score

4.7%

Top 9% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

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 No

Public POC No

EPSS 4.7%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

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

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +5

CVSS: +36

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Affected Products (CPE)NVD

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

cpe:2.3:a:ivanti:connect_secure:9.1:r1.0:*:*:*:*:*:*

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

cpe:2.3:a:ivanti:connect_secure:9.1:r11.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.1:r2.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.1:r3.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.1:r4.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.1:r5.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.1:r6.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.1:r7.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.1:r8.0:*:*:*:*:*:*

cpe:2.3:a:ivanti:connect_secure:9.1:r9.0:*:*:*:*:*:*

cpe:2.3:a:pulsesecure:pulse_connect_secure:*:*:*:*:*:*:*:*

More in Pulse Connect Secure

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An issue was discovered in Pulse Secure Pulse Connect Secure (PCS) through 2020-04-06. Rated critical severity (CVSS 9.1

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In Pulse Secure Pulse Connect Secure (PCS) before 8.1R15.1, 8.2 before 8.2R12.1, 8.3 before 8.3R7.1, and 9.0 before 9.0R

CVE-2019-11542 HIGH This Week POC

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CVE-2020-8238 MEDIUM This Month POC

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A vulnerability has been discovered in login.cgi in Pulse Secure Pulse Connect Secure (PCS) 8.1RX before 8.1R12 and 8.3R

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The Secure Meeting (Pulse Collaboration) in Pulse Connect Secure (formerly Juniper Junos Pulse) before 7.1R22.1, 7.4, 8.

Same weakness CWE-120 – Classic Buffer Overflow

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CVE-2017-7269 CRITICAL POC

9.8

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9.8

CVE-2016-10174 CRITICAL POC

9.8

CVE-2016-0099 HIGH POC

7.8

CVE-2016-6366 HIGH POC

8.8

CVE-2013-1331 HIGH

7.8

CVE-2013-0641 HIGH

7.8

CVE-2017-15222 CRITICAL POC

9.8

Same technique Buffer Overflow

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CVE-2015-5119 CRITICAL POC

9.8

CVE-2015-3113 CRITICAL POC

9.8

CVE-2011-2462 CRITICAL POC

9.8

CVE-2020-0796 CRITICAL POC

10.0

CVE-2009-0927 HIGH POC

8.8

CVE-2012-1889 HIGH POC

8.8

References

Advisories & patches

ADVISORY https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44858/?kA23Z000000L6oySAC

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GitHub PoC

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