# CVE-2018-11574: Integer overflow in n/a

> Integer overflow in PPPD EAP-TLS allows crashes, data leaks, or auth bypass; affects Linux systems using specific PPP configurations.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Jun 2018
- **Updated:** 3 Dec 2025
- **Also known as:** DEBIAN-CVE-2018-11574, GHSA-hx7c-3c6c-mhm3, UBUNTU-CVE-2018-11574, USN-3810-1

## What is CVE-2018-11574?

CVE-2018-11574 is a critical vulnerability in Canonical Ubuntu Linux, published on 14 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper input validation together with an integer overflow in the EAP-TLS protocol implementation in PPPD may cause a crash, information disclosure, or authentication bypass. This implementation is distributed as a patch for PPPD 0.91, and includes the affected eap.c and eap-tls.c files. Configurations that use the `refuse-app` option are unaffected.

Weakness: CWE-20 (Improper Input Validation), CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2018-11574?

It affects 2 products.


Products: Canonical Ubuntu Linux, Point-to-Point Protocol Project Point-to-Point Protocol.

## How do I fix CVE-2018-11574?

Apply the vendor's patch.

## Is CVE-2018-11574 being exploited?

There is no known exploitation of CVE-2018-11574 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-11574 and fix it if it is affected.

What it is: CVE-2018-11574 is a critical vulnerability in Canonical Ubuntu Linux, published on 14 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-11574 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2018-11574/ (Markdown: https://insights.sbomify.com/CVE-2018-11574/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-11574
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-11574
- OSV: https://osv.dev/vulnerability/CVE-2018-11574

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-11574/
Summaries are generated and may contain mistakes; the official description above is the record.