CVE-2017-5567

What it is

Code injection vulnerability in Avast Premier 12.3 (and earlier), Internet Security 12.3 (and earlier), Pro Antivirus 12.3 (and earlier), and Free Antivirus 12.3 (and earlier) allows a local attacker to bypass a self-protection mechanism, inject arbitrary code, and take full control of any Avast process via a "DoubleAgent" attack. One perspective on this issue is that (1) these products do not use the Protected Processes feature, and therefore an attacker can enter an arbitrary Application Verifier Provider DLL under Image File Execution Options in the registry; (2) the self-protection mechanism is intended to block all local processes (regardless of privileges) from modifying Image File Execution Options for these products; and (3) this mechanism can be bypassed by an attacker who temporarily renames Image File Execution Options during the attack.

At a glance

Exploitability

Can be exploited locally on the machine with an admin-level account. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.5% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2017-03-21 16:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 01:20 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.5% in the next 30 days (EPSS).
• Severity: 6.7 MEDIUM (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2017-03-21 16:59 UTC

Last modified

2026-06-17 01:20 UTC

Exploit probability

0.5% · EPSS, next 30 days

Weakness

CWE-427

Record status

Modified

Affected

• Avast Free Antivirus ≤ 12.3
• Avast Internet Security ≤ 12.3
• Avast Premier ≤ 12.3
• Avast Pro Antivirus ≤ 12.3

Attack profile CVSS 3.0 · 6.7

Attack vector

Local

Complexity

Low

Privileges needed

High

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2017-5567.md and follow it. Check whether this project is affected by CVE-2017-5567. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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