InnoSetup Installer uncontrolled search path

Answer in brief

CVE-2017-20051 records a Medium severity (CVSS 5.3) vulnerability in InnoSetup Installer uncontrolled search path. The current sources do not mark it as known exploited. The current feed maps InnoSetup/Installer (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 16, 2022Updated Sep 29, 2026Source checked Sep 29, 2026First seen by HOL Sep 29, 2026Material review Sep 29, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps InnoSetup/Installer (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
InnoSetup/Installergeneric	5.5.9	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for InnoSetup/Installer.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 16, 2022
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 29, 2026

Sources and claim methodology

Upstream source description

A vulnerability was detected in InnoSetup Installer 5.5.9. This affects an unknown part. The manipulation results in uncontrolled search path. The attack can be executed remotely. The exploit is now public and may be used. This is a malformed-PE / self-extracting-installer defect report that the vendor never acknowledged.

Quoted source text, attributed separately from HOL analysis.