CVE-2019-6443

CRITICALNVD 9.19.1—Weaponized

9.1

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.

CVSS v3: 9.1
EG Score: 9.1(medium)
EPSS: 97.7%
KEV: Not listed

Published

January 16, 2019

Last Modified

November 21, 2024

References (8)

cve@mitrehttps://dumpco.re/blog/ntpsec-bugs
cve@mitrehttps://dumpco.re/bugs/ntpsec-oobread1
cve@mitrehttps://github.com/ntpsec/ntpsec/blob/NTPsec_1_1_3/NEWS
cve@mitrehttps://www.exploit-db.com/exploits/46175/
af854a3a-2127-422b-91ae-364da2661108https://dumpco.re/blog/ntpsec-bugs
af854a3a-2127-422b-91ae-364da2661108https://dumpco.re/bugs/ntpsec-oobread1
af854a3a-2127-422b-91ae-364da2661108https://github.com/ntpsec/ntpsec/blob/NTPsec_1_1_3/NEWS
af854a3a-2127-422b-91ae-364da2661108https://www.exploit-db.com/exploits/46175/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-125Out-of-bounds Read

Data Freshness Timeline

(refreshed 7× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 06:08 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 23:21 UTCEG score recompute
2026-05-27 23:20 UTCGHSA enrichment
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-46175✓ verified
First seen Jan 16, 2019
NTPsec 1.1.2 - 'ctl_getitem' Out-of-Bounds Read (PoC)
Open source ↗
Nucleijavascript/cves/2019/CVE-2019-6443.yaml
First seen Jan 1, 2019
NTPsec > 1.1.3 - 'ctl_getitem' Out-of-Bounds Read
Open source ↗

Frequently asked(5)

What is CVE-2019-6443?

CVE-2019-6443 is a critical vulnerability published on January 16, 2019. An issue was discovered in NTPsec before 1.1.3. Because of a bug in ctlgetitem, there is a stack-based buffer over-read in readsysvars in ntp_control.c in ntpd.

When was CVE-2019-6443 disclosed?

CVE-2019-6443 was first published in the National Vulnerability Database on January 16, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2019-6443 actively exploited?

CVE-2019-6443 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 97.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-6443?

CVE-2019-6443 has a CVSS v3 base score of 9.1 (NVD).

How do I remediate CVE-2019-6443?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-6443, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2019-6443

📅 Published

🔄 Last Modified

🔗 References (8)

Weakness Classification(1)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-6443?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (8)

Frequently asked(5)

Related CVEs(same CWE)