# CVE-2019-3586: McAfee Endpoint Security firewall not always acting on GTI lookup results

> Attackers can bypass McAfee Endpoint Security firewall protections by manipulating GTI reputation data to prevent blocking of malicious IP addresses.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 May 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-ggq9-q258-r9g6

## What is CVE-2019-3586?

CVE-2019-3586 is a high-severity vulnerability in McAfee, LLC McAfee Endpoint Security (ENS), published on 15 May 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Protection Mechanism Failure in the Firewall in McAfee Endpoint Security (ENS) 10.x prior to 10.6.1 May 2019 update allows context-dependent attackers to circumvent ENS protection where GTI flagged IP addresses are not blocked by the ENS Firewall via specially crafted malicious sites where the GTI reputation is carefully manipulated and does not correctly trigger the ENS Firewall to block the connection.

Weakness: CWE-693 (Protection Mechanism Failure)

## Which versions are affected by CVE-2019-3586?

It affects 1 product.


Products: Mcafee Endpoint Security.

## How do I fix CVE-2019-3586?

No fix has been published for CVE-2019-3586 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-3586 being exploited?

There is no known exploitation of CVE-2019-3586 in the wild and no public exploit code.

## Other vulnerabilities in McAfee, LLC McAfee Endpoint Security (ENS)

- [CVE-2020-7319](https://insights.sbomify.com/CVE-2020-7319/): Improper Access Control Vulnerability in ENS for Windows (high 8.8)
- [CVE-2020-7264](https://insights.sbomify.com/CVE-2020-7264/): Privilege Escalation vulnerability through symbolic links in ENS for Windows (high 8.8)
- [CVE-2020-7265](https://insights.sbomify.com/CVE-2020-7265/): Privilege Escalation vulnerability through symbolic links in ENSM (high 8.8)
- [CVE-2019-3582](https://insights.sbomify.com/CVE-2019-3582/): McAfee Endpoint Security updates fix a privilege escalation vulnerability (high 8.6)
- [CVE-2020-7257](https://insights.sbomify.com/CVE-2020-7257/): Privilege Escalation vulnerability through Symbolic links in ENS (high 8.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-3586 and fix it if it is affected.

What it is: CVE-2019-3586 is a high-severity vulnerability in McAfee, LLC McAfee Endpoint Security (ENS), published on 15 May 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-3586 in the wild and no public exploit code.

Affected product: McAfee, LLC McAfee Endpoint Security (ENS). No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-3586/ (Markdown: https://insights.sbomify.com/CVE-2019-3586/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-3586
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-3586
- OSV: https://osv.dev/vulnerability/CVE-2019-3586

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-3586/
Summaries are generated and may contain mistakes; the official description above is the record.