CVE-2020-11634

SYSTEM code execution via OpenSSL DLL hijacking

Published Jul 15, 2021 · Updated Aug 4, 2024

DLL hijacking in Zscaler Client Connector for Windows before 2.1.2.105 allows local users to execute arbitrary code as SYSTEM. The OpenSSL configuration allows the client to load an incorrect DLL, but Zscaler has not identified the affected binary or searched location. The attack requires local access; successful loading runs the planted DLL with SYSTEM privileges and permits complete control of the host.

CVSS severity7.8
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DLL hijacking in Zscaler Client Connector for Windows before 2.1.2.105 allows local users to execute arbitrary code as SYSTEM. The OpenSSL configuration allows the client to load an incorrect DLL, but Zscaler has not identified the affected binary or searched location. The attack requires local access; successful loading runs the planted DLL with SYSTEM privileges and permits complete control of the host.

The record

CVE
CVE-2020-11634
Published
Jul 15, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-427, CAPEC-471, T1574.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2021CVE 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.9NIST NVDAV:L/AC:M/Au:N/C:C/I:C/A:C
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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-427Uncontrolled Search Path Element
CAPEC-471Search Order Hijacking
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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