CVE-2021-25699

Local privilege escalation via OpenSSL configuration autoload

Published Jul 21, 2021 · Updated Aug 3, 2024

Untrusted DLL loading in Teradici PCoIP Software Client before 21.07.0 allows local users to gain the client's process privileges. Its OpenSSL component was built without no-autoload-config, permitting a crafted DLL in a build configuration directory to load. Exploitation requires local DLL placement and user interaction that starts the client, and code runs with the process's privileges.

CVSS severity7.8
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Untrusted DLL loading in Teradici PCoIP Software Client before 21.07.0 allows local users to gain the client's process privileges. Its OpenSSL component was built without no-autoload-config, permitting a crafted DLL in a build configuration directory to load. Exploitation requires local DLL placement and user interaction that starts the client, and code runs with the process's privileges.

The record

CVE
CVE-2021-25699
Published
Jul 21, 2021
Updated
Aug 3, 2024
Vendor
Teradici
Product
PCoIP Software Client
Classifications
CWE-426, T1574.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 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=21.07.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Teradici · PCoIP Software Clientversion=21.07.0

Published CVSS scores

4.4NIST NVDAV:L/AC:M/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-426Untrusted Search Path
T1574.001Hijack Execution Flow: DLL

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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