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CVE-2019-11634

9.8, critical Known exploited Used in ransomware

Citrix Workspace Application and Receiver for Windows Remote Code Execution Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
8% higher than 94.7% of scored CVEs
Exploitation
Confirmed in the wild
Published
22 May 20197 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 3 Nov 2021 and links it to ransomware activity. US federal agencies had to remediate by 3 May 2022, a deadline that has passed.

Required action. Apply updates per vendor instructions.

Description

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

Details

Vendor
Citrix
Product
Receiver
Weakness
CWE-284 (opens in a new tab)
Status
Analyzed
Updated
12 Aug 2026
Assigner
cve@mitre.org

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 3

Advisories 2

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Citrix CVEs

Every Citrix CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-88779 Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability KEV EPSS 0.6% 7.5, high
  • CVE-2026-88771 Citrix NetScaler Improper Input Validation Vulnerability KEV EPSS 1% 9.8, critical
  • CVE-2026-88772 Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability KEV EPSS 1% 8.1, high
  • CVE-2026-19490 Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability KEV EPSS 23% 9.8, critical
  • CVE-2026-8452 Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability KEV EPSS 1% 9.8, critical
  • CVE-2026-3055 Citrix NetScaler Out-of-Bounds Read Vulnerability KEV EPSS 4% 9.8, critical
  • CVE-2025-7775 Citrix NetScaler Memory Overflow Vulnerability KEV EPSS 20% 9.8, critical
  • CVE-2025-6543 Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability KEV EPSS 11% 9.8, critical

Beyond this page

Is CVE-2019-11634 in your network?

This page tells you how dangerous CVE-2019-11634 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2019-11634 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2019-11634 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.