# CVE-2019-19269: Null dereference in n/a

> A NULL pointer dereference in ProFTPD causes a crash when validating client certificates with an empty CRL, requiring mutual authentication.

- **Severity:** Medium 4.9 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Nov 2019
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2019-19269, DLA-2018-1, GHSA-46rx-rvqp-8rxj, MGASA-2019-0385, UBUNTU-CVE-2019-19269

## What is CVE-2019-19269?

CVE-2019-19269 is a medium-severity vulnerability in Debian Debian Linux, published on 26 Nov 2019. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

An issue was discovered in tls_verify_crl in ProFTPD through 1.3.6b. A dereference of a NULL pointer may occur. This pointer is returned by the OpenSSL sk_X509_REVOKED_value() function when encountering an empty CRL installed by a system administrator. The dereference occurs when validating the certificate of a client connecting to the server in a TLS client/server mutual-authentication setup.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2019-19269?

It affects 3 products.


Products: Debian Debian Linux, Fedoraproject Fedora, Proftpd Proftpd.

## How do I fix CVE-2019-19269?

Apply the vendor's patch.

## Is CVE-2019-19269 being exploited?

There is no known exploitation of CVE-2019-19269 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-19269 and fix it if it is affected.

What it is: CVE-2019-19269 is a medium-severity vulnerability in Debian Debian Linux, published on 26 Nov 2019. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-19269 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-2019-19269/ (Markdown: https://insights.sbomify.com/CVE-2019-19269/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-19269
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-19269
- OSV: https://osv.dev/vulnerability/CVE-2019-19269

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-19269/
Summaries are generated and may contain mistakes; the official description above is the record.