CVE-2020-3979

HIGH
7.8
CVSS Score
Published: September 18, 2020 at 05:37 PM UTC
Updated: June 17, 2026 at 03:19 AM UTC
1 product affected across 1 vendorInstallbuilder· also runs on 1 platform

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Severity
HIGH7.8
Exploit prediction
EPSS 0.4%

Description

InstallBuilder for Qt Windows (versions prior to 20.7.0) installers look for plugins at a predictable location at initialization time, writable by non-admin users. While those plugins are not required, they are loaded if present, which could allow an attacker to plant a malicious library which could result in code execution with the security scope of the installer.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 20.7.0
Affected range stops below 20.7.0, so it looks safe — our inference, not a vendor statement
microsoft-windows (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-427

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