CVE-2019-6443

Exp

An issue was discovered in NTPsec before 1.1.3. Because of a bug in ctl_getitem, there is a stack-based buffer over-read in read_sysvars in ntp_control.c in ntpd.

Published: 2019-01-16 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-6443 is rated High Exploit Risk (88.8/100): CVSS Critical severity, with high exploitation likelihood (EPSS 47.17%, 98th percentile). 4 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +3.22% over the last day, indicating growing attacker interest. 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-2019-6443

EDB-ID Source Kind Published Link
46175 exploit_db edb 2019-01-16 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2019-6443

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 2026-05-26 43.95% 47.17% +3.22%
2 2026-04-01 36.99% 43.95% +6.96%
3 2026-03-19 — 36.99% —

Full EPSS history (36 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-6443

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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:H)
Serious risk that confidential data gets exposed in a big 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.
 3.9 5.2 [email protected]
6.4 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 4.9 [email protected]

Weakness enumeration for CVE-2019-6443

OS Trackers for CVE-2019-6443

vendor priority summary link
alpine critical CVE-2019-6443: 1 source package rows (ntpsec); 7 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 0. https://security.alpinelinux.org/vuln/CVE-2019-6443
debian not yet assigned CVE-2019-6443 not yet assigned priority: Debian including 1 source packages (ntpsec), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-6443
ubuntu medium CVE-2019-6443 medium priority: Ubuntu including 1 source packages (ntpsec), 5 status rows across 5 suites (bionic, cosmic, trusty, upstream, xenial): released 3, DNE 2. https://ubuntu.com/security/CVE-2019-6443

Affected software / configurations for CVE-2019-6443

Vendor Product Version Raw CPE
ntpsec ntpsec < 1.1.3 cpe:2.3:a:ntpsec:ntpsec:*:*:*:*:*:*:*:*

References for CVE-2019-6443

URL Tags
https://dumpco.re/blog/ntpsec-bugs Exploit Third Party Advisory
https://dumpco.re/bugs/ntpsec-oobread1 Exploit Third Party Advisory
https://github.com/ntpsec/ntpsec/blob/NTPsec_1_1_3/NEWS Release Notes Third Party Advisory
https://www.exploit-db.com/exploits/46175/ Exploit Third Party Advisory VDB Entry
cvelogic Threat Intelligence