What is the CVSS score of CVE-2019-11634?

CVE-2019-11634 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 8.1%.

Is CVE-2019-11634 being actively exploited?

Yes, CVE-2019-11634 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active in-the-wild exploitation. Immediate patching is required.

Workspace CVE-2019-11634

CRITICAL

Improper Access Control (CWE-284)

2019-05-22 cve@mitre.org

Authentication Bypass Microsoft Citrix Workspace Receiver

9.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-284 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Access control enforcement MITRE ATT&CK 1 technique across 1 tactic: Defense Evasion 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 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.

Emergency Immediate action required. Why: CRITICAL + in CISA KEV (actively exploited), no patch available.

Exploited in the wild (CISA KEV) No patch listed yet 8.1% exploitation probability (EPSS)

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AnalysisAI

Citrix Workspace App before 1904 for Windows has Incorrect Access Control. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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 under CWE-284. Citrix Workspace App before 1904 for Windows has Incorrect Access Control. Affected products include: Citrix Receiver, Citrix Workspace. Version information: before 1904.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/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

None

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 22, 2019 - 17:29 nvd

CRITICAL 9.8

DescriptionNVD

Citrix Workspace App before 1904 for Windows has Incorrect Access Control.

Threat Intelligence Overview

EPSS Score

8.1%

Top 6% exploitable

Data Quality

4 sources

Confidence: Medium

Citrix

NVD

CVE.org

CISA KEV

EPSS

VulDB

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 CRITICAL

CISA KEV Yes

Public POC No

EPSS 8.1%

Patch available No

Active threat Yes

Deciding rule

CRITICAL + in CISA KEV (actively exploited), no patch available

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

Immediate

Exploitation· derived

Active

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

High

Priority Score

107

Low Medium High Critical

KEV: +50

EPSS: +8

CVSS: +49

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:a:citrix:receiver:4.9:cumulative_update_6:*:*:windows:*:*:*

cpe:2.3:a:citrix:workspace:*:*:*:*:*:windows:*:*

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Same weakness CWE-284 – Improper Access Control

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CVE-2015-3306 CRITICAL POC

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CVE-2011-3544 CRITICAL POC

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CVE-2012-1723 CRITICAL POC

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CVE-2012-5076 CRITICAL POC

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CVE-2014-3120 HIGH POC

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CVE-2013-2423 LOW POC

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CVE-2016-3427 CRITICAL

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Same technique Authentication Bypass

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CVE-2023-22515 CRITICAL POC

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CVE-2013-2465 CRITICAL POC

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CVE-2022-40684 CRITICAL POC

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CVE-2025-61882 CRITICAL POC

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CVE-2024-0012 CRITICAL POC

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References

Advisories & patches

ADVISORY https://support.citrix.com/article/CTX251986 ADVISORY https://support.citrix.com/v1/search?searchQuery=%22%22&lang=en&sort=cr_date_desc&prod=&pver=&ct=Security+Bulletin ADVISORY https://vuldb.com/vuln/135307 REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11634

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