CVE-2019-11366

Severity: medium (CVSS 5.9 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-04-20 · updated 2026-06-17
Weakness: CWE-476

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.

Affected products

Atftp Project Atftp: 0.7.1

References

https://lists.debian.org/debian-lts-announce/2019/05/msg00012.html
https://pulsesecurity.co.nz/advisories/atftpd-multiple-vulnerabilities
https://seclists.org/bugtraq/2019/May/16
https://security.gentoo.org/glsa/202003-14
https://sourceforge.net/p/atftp/code/ci/382f76a90b44f81fec00e2f609a94def4a5d3580/
https://usn.ubuntu.com/4540-1/
https://www.debian.org/security/2019/dsa-4438
https://lists.debian.org/debian-lts-announce/2019/05/msg00012.html
https://pulsesecurity.co.nz/advisories/atftpd-multiple-vulnerabilities
https://seclists.org/bugtraq/2019/May/16
https://security.gentoo.org/glsa/202003-14
https://sourceforge.net/p/atftp/code/ci/382f76a90b44f81fec00e2f609a94def4a5d3580/

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