CVE-2019-11366

Exp

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.

Published: 2019-04-20 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-11366 is rated High Exploit Risk (67.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.10%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2019-11366

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2019-11366

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.33% 2.10% +0.77%
2 2026-02-03 1.36% 1.33% -0.03%
3 2025-03-30 — 1.36% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-11366

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.0 MEDIUM
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2019-11366

OS Trackers for CVE-2019-11366

vendor priority summary link
debian not yet assigned CVE-2019-11366 not yet assigned priority: Debian including 1 source packages (atftp), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-11366
gentoo high CVE-2019-11366: 1 GLSA(s) (202003-14), 1 atom(s) (net-ftp/atftp); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-11366
suse medium CVE-2019-11366 severity moderate: SUSE including 3 source package names (atftp-0.7.0-135.16.16.3.1, atftp-0.7.0-135.23.3.1, atftp-0.7.0-160.8.1), 24 product×package rows across 24 product lines (SUSE Enterprise Storage 4, SUSE Linux Enterprise Desktop 12 SP3, … (24 product lines)): Fixed 24. https://www.suse.com/security/cve/CVE-2019-11366/
ubuntu medium CVE-2019-11366 medium priority: Ubuntu including 1 source packages (atftp), 9 status rows across 9 suites (bionic, cosmic, disco, eoan, focal, groovy, trusty, upstream, xenial): not-affected 3, ignored 2, released 2, DNE 1, needs-triage 1. https://ubuntu.com/security/CVE-2019-11366

Affected software / configurations for CVE-2019-11366

Vendor Product Version Raw CPE
atftp_project atftp 0.7.1 cpe:2.3:a:atftp_project:atftp:0.7.1:*:*:*:*:*:*:*

References for CVE-2019-11366

cvelogic Threat Intelligence