# CVE-2018-8019: Auth bypass in Apache Tomcat Native

> Attackers can authenticate using revoked client certificates when OCSP is enabled, bypassing mutual TLS security controls.

- **Severity:** High 7.4 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 31 Jul 2018
- **Updated:** 16 Sep 2024
- **Also known as:** DEBIAN-CVE-2018-8019, GHSA-w5fc-h82j-vq6w, UBUNTU-CVE-2018-8019

## What is CVE-2018-8019?

CVE-2018-8019 is a high-severity authentication bypass vulnerability in Debian Debian Linux, published on 31 Jul 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

When using an OCSP responder Apache Tomcat Native 1.2.0 to 1.2.16 and 1.1.23 to 1.1.34 did not correctly handle invalid responses. This allowed for revoked client certificates to be incorrectly identified. It was therefore possible for users to authenticate with revoked certificates when using mutual TLS. Users not using OCSP checks are not affected by this vulnerability.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2018-8019?

It affects 2 products.


Products: Apache Tomcat Native, Debian Debian Linux.

## How do I fix CVE-2018-8019?

Upgrade to a fixed version.

## Is CVE-2018-8019 being exploited?

There is no known exploitation of CVE-2018-8019 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2026-86246](https://insights.sbomify.com/CVE-2026-86246/): Apache Tomcat Native: Insecure OpenSSL options enabled (critical 9.1)
- [CVE-2026-86243](https://insights.sbomify.com/CVE-2026-86243/): Apache Tomcat Native: DoS via TLS handshake (high 7.5)
- [CVE-2026-86247](https://insights.sbomify.com/CVE-2026-86247/): Apache Tomcat Native: Client certificate requirements can be down-graded (high 7.4)
- [CVE-2018-8020](https://insights.sbomify.com/CVE-2018-8020/): Auth bypass in Apache Tomcat Native (high 7.4)
- [CVE-2017-15698](https://insights.sbomify.com/CVE-2017-15698/): Security feature bypass in Apache Tomcat Native (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-8019 and fix it if it is affected.

What it is: CVE-2018-8019 is a high-severity authentication bypass vulnerability in Debian Debian Linux, published on 31 Jul 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-2018-8019 in the wild and no public exploit code.

Affected product: Debian Debian 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-2018-8019/ (Markdown: https://insights.sbomify.com/CVE-2018-8019/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-8019
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-8019
- OSV: https://osv.dev/vulnerability/CVE-2018-8019

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-8019/
Summaries are generated and may contain mistakes; the official description above is the record.