CVE-2019-11366
An issue was discovered in atftpd in atftp 0.7.1. It does not lock the thread_list_mutex mutex...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2019-11366- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:N/A:P - Weakness
- CWE-476
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2019-11366- Updated
- 2026-11-02
EUVDEUVD-2019-3044 No score
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.
- Record
EUVD-2019-3044- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-4hq6-rhmw-hgw9 No score
An issue was discovered in atftpd in atftp 0.7.1. It does not lock the thread_list_mutex mutex...
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.
- Record
GHSA-4hq6-rhmw-hgw9- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2019-11366- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2019-11366
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.
- Record
DEBIAN-CVE-2019-11366- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Show 5 moreShow less
OSVUBUNTU-CVE-2019-11366
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.
- Record
UBUNTU-CVE-2019-11366- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVSUSE-SU-2019:1091-1 No score
Security update for atftp
This update for atftp fixes the following issues:
Security issues fixed:
- CVE-2019-11366: Fixed a denial of service caused by a NULL pointer dereference because thread_list_mutex was not locked (bsc#1133145).
- CVE-2019-11365: Fixed a buffer overflow which could lead to remote code execution caused by an insecure use of strncpy() (bsc#1133114).
- Record
SUSE-SU-2019:1091-1- Updated
- 2026-11-02
OSVSUSE-SU-2019:14033-1 No score
Security update for atftp
This update for atftp fixes the following issues:
Security issues fixed:
- CVE-2019-11366: Fixed a denial of service caused by a NULL pointer dereference because thread_list_mutex was not locked (bsc#1133145).
- CVE-2019-11365: Fixed a buffer overflow which could lead to remote code execution caused by an insecure use of strncpy() (bsc#1133114).
- Record
SUSE-SU-2019:14033-1- Updated
- 2026-11-02
OSVUSN-4540-1 No score
atftp vulnerabilities
Denis Andzakovic discovered that atftpd incorrectly handled certain malformed packets. A remote attacker could send a specially crafted packet to cause atftpd to crash, resulting in a denial of service. (CVE-2019-11365)
Denis Andzakovic discovered that atftpd did not properly lock the thread list mutex. An attacker could send a large number of tftpd packets simultaneously when running atftpd in daemon mode to cause atftpd to crash, resulting in a denial of service. (CVE-2019-11366)
- Record
USN-4540-1- Updated
- 2026-11-02
OSVUSN-4643-1 No score
atftp vulnerabilities
It was discovered that atftp's FTP server did not properly handler certain input. An attacker could use this to to cause a denial of service (crash) or possibly execute arbitrary code. (CVE-2019-11365)
It was discovered that atftp's FTP server did not make proper use of mutexes when locking certain data structures. An attacker could use this to cause a denial of service via a NULL pointer dereference. (CVE-2019-11366)
- Record
USN-4643-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
atftpDebian:12 |
before 0.7.git20120829-3.1 | 0.7.git20120829-3.1 |
atftpDebian:13 |
before 0.7.git20120829-3.1 | 0.7.git20120829-3.1 |
atftpDebian:14 |
before 0.7.git20120829-3.1 | 0.7.git20120829-3.1 |
atftpDebian:8 |
before 0.7.git20120829-1+deb8u1, plus listed versions 0.7.git20120829-1 |
0.7.git20120829-1+deb8u1 |
atftpDebian:9 |
before 0.7.git20120829-3.1~deb9u1, plus listed versions 0.7.git20120829-3 |
0.7.git20120829-3.1~deb9u1 |
atftpSUSE:OpenStack Cloud 7 |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Linux Enterprise Desktop 12 SP3 |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Linux Enterprise Desktop 12 SP4 |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Linux Enterprise Server for SAP Applications 12 SP1 |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Linux Enterprise Server for SAP Applications 12 SP2 |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
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| Package | Affected | Fixed |
|---|---|---|
atftpSUSE:Linux Enterprise Server 12-LTSS |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Linux Enterprise Server 12 SP1-LTSS |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Linux Enterprise Server 12 SP2-LTSS |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Linux Enterprise Server 12 SP2-BCL |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Linux Enterprise Server 12 SP3 |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Linux Enterprise Server for SAP Applications 12 SP3 |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Linux Enterprise Server 12 SP4 |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Linux Enterprise Server for SAP Applications 12 SP4 |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Enterprise Storage 4 |
before 0.7.0-160.8.1 | 0.7.0-160.8.1 |
atftpSUSE:Linux Enterprise Point of Sale 11 SP3 |
before 0.7.0-135.23.3.1 | 0.7.0-135.23.3.1 |
atftpSUSE:Linux Enterprise Server 11 SP4-LTSS |
before 0.7.0-135.23.3.1 | 0.7.0-135.23.3.1 |
atftpUbuntu:16.04:LTS |
before 0.7.git20120829-3.1~0.16.04.1, plus listed versions 0.7.git20120829-2.1 |
0.7.git20120829-3.1~0.16.04.1 |
atftpUbuntu:18.04:LTS |
before 0.7.git20120829-3.1~0.18.04.1, plus listed versions 0.7.git20120829-3 |
0.7.git20120829-3.1~0.18.04.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-11366 is a medium vulnerability (CVSS 5.9) in Atftp Project Atftp, published April 20, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.10%, the 81st percentile. Fixed in atftp 0.7.git20120829-3.1.
References
pulsesecurity.co.nz/advisories/atftpd-multiple-vulnerabilities
sourceforge.net/p/atftp/code/ci/382f76a90b44f81fec00e2f609a94def4a5d3580
debian.org/security/2019/dsa-4438
seclists.org/bugtraq/2019/May/16
lists.debian.org/debian-lts-announce/2019/05/msg00012.html
security.gentoo.org/glsa/202003-14
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usn.ubuntu.com/4540-1
nvd.nist.gov/vuln/detail/CVE-2019-11366
github.com/advisories/GHSA-4hq6-rhmw-hgw9
security-tracker.debian.org/tracker/CVE-2019-11366
suse.com/support/update/announcement/2019/suse-su-20191091-1
bugzilla.suse.com/1133114
ubuntu.com/security/CVE-2019-11366
cve.org/CVERecord?id=CVE-2019-11366