---
id: CVE-2017-20051
title: A vulnerability was detected in InnoSetup Installer 5.5.9
summary: >-
  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
  malf…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-426
  - CWE-427
vendor: jrsoftware
product: inno_setup
affected:
  - inno_setup
published: '2022-06-16'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T06:16:56.450'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2017-20051'
references:
  - url: 'http://seclists.org/fulldisclosure/2017/Mar/8'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2017-20051'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/97837'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/97837/cti'
    label: cna@vuldb.com
  - url: 'http://seclists.org/fulldisclosure/2017/Mar/8'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://vuldb.com/?id.97837'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-04-14T17:11:18.734072Z'
epss: 0.00575
epssPercentile: 0.45248
ingestedAt: '2026-09-29T06:28:45.420Z'
---

## Overview

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.

## Affected

- `inno_setup`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.