CVE-2020-13885Public exploit

SYSTEM privilege escalation via malicious webio.dll loading

Published Jun 8, 2020 · Updated Aug 4, 2024

Insecure permissions in Citrix Workspace App before 1912 for Windows allow local users to gain SYSTEM privileges during uninstallation. The uninstaller loads webio.dll from a writable %PROGRAMDATA%\Citrix\Citrix Workspace #### directory, allowing a local user to plant a malicious DLL. Execution requires an administrator or software-distribution process to uninstall the application, at which point the planted DLL runs with SYSTEM privileges.

CVSS severity7.8
High
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure permissions in Citrix Workspace App before 1912 for Windows allow local users to gain SYSTEM privileges during uninstallation. The uninstaller loads webio.dll from a writable %PROGRAMDATA%\Citrix\Citrix Workspace #### directory, allowing a local user to plant a malicious DLL. Execution requires an administrator or software-distribution process to uninstall the application, at which point the planted DLL runs with SYSTEM privileges.

The record

CVE
CVE-2020-13885
Published
Jun 8, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-276, T1574.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1574.001DLL Search Order Hijacking

Public exploit references

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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