CVE-2021-22907

Local SYSTEM privilege escalation

Published May 27, 2021 · Updated Aug 3, 2024

Improper access control in Citrix Workspace app for Windows before 2105 or before 1912 LTSR CU4 allows local users to gain SYSTEM privileges. Citrix has not published the affected component or the access-control operation that mishandles local input. The flaw is reachable only when the app was installed by a local or domain administrator; Windows Store and user-installed copies are unaffected.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Citrix Workspace app for Windows before 2105 or before 1912 LTSR CU4 allows local users to gain SYSTEM privileges. Citrix has not published the affected component or the access-control operation that mishandles local input. The flaw is reachable only when the app was installed by a local or domain administrator; Windows Store and user-installed copies are unaffected.

The record

CVE
CVE-2021-22907
Published
May 27, 2021
Updated
Aug 3, 2024
Vendor
Citrix
Product
Citrix Workspace app for Windows
Classifications
CWE-284, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Citrix Workspace App for Windows 2105 and 1912 LTSR CU4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Citrix · Citrix Workspace app for Windowsversion=Citrix Workspace App for Windows 2105 and 1912 LTSR CU4

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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