How severe is CVE-2019-6444?

CVE-2019-6444 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2019-6444 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 46% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-6444?

CVE-2019-6444 affects Ntpsec. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-6444?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-6444 published?

CVE-2019-6444 was published on 2019-01-16 and last updated on 2026-06-17.

CVE-2019-6444

CVE-2019-6444 is a critical-severity vulnerability in Ntpsec with a CVSS 3.x base score of 9.1. Its EPSS exploit-prediction score of 46% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-125.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 46% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Ntpsec
Published: 2019-01-16
Last modified: 2026-06-17

Description

An issue was discovered in NTPsec before 1.1.3. process_control() in ntp_control.c has a stack-based buffer over-read because attacker-controlled data is dereferenced by ntohl() in ntpd.

Frequently asked questions

What is CVE-2019-6444?: An issue was discovered in NTPsec before 1.1.3. process_control() in ntp_control.c has a stack-based buffer over-read because attacker-controlled data is dereferenced by ntohl() in ntpd.
How severe is CVE-2019-6444?: CVE-2019-6444 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2019-6444 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 46% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-6444?: CVE-2019-6444 affects Ntpsec. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-6444?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-6444 published?: CVE-2019-6444 was published on 2019-01-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ntpsec:ntpsec:*:*:*:*:*:*:*:*

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