# CVE-2019-11366: atftp: An issue was discovered in atftpd in atftp 0.7.1

CVE-2019-11366 is fixed in 2 products on 1 platform, first by atftp 0.7.git20120829-3.1~0.18.04.1, released April 20, 2019. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2019-11366
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0210
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 20, 2019

## Description

An issue was discovered in atftpd in atftp 0.7.1. It does not lock the thread_list_mutex mutex before assigning the current thread data structure. As a result, the daemon is vulnerable to a denial of service attack due to a NULL pointer dereference. If thread_data is NULL when assigned to current, and modified by another thread before a certain tftpd_list.c check, there is a crash when dereferencing current->next.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | atftp Ubuntu 18.04.6 LTS (bionic) | 0.7.git20120829-3.1~0.18.04.1 | [atftp 0.7.git20120829-3.1~0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-atftp-0.7.git20120829-3.1-0.18.04.1.md) | Apr 20, 2019 |
| Linux | atftpd Ubuntu 18.04.6 LTS (bionic) | 0.7.git20120829-3.1~0.18.04.1 | [atftpd 0.7.git20120829-3.1~0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-atftpd-0.7.git20120829-3.1-0.18.04.1.md) | Apr 20, 2019 |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo