What’s Vulnerable › Vulnerabilities

CVE-2019-6443

• Severity: critical (CVSS 9.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 66.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-01-16 · updated 2026-06-17
• Weakness: CWE-125

Description

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.

Affected products

• ntpsec: before 1.1.3 — fixed in 1.1.3

How to fix

Upgrade to a fixed version: ntpsec 1.1.3. Check the vendor advisory for mitigations.

References

• https://dumpco.re/blog/ntpsec-bugs
• https://dumpco.re/bugs/ntpsec-oobread1
• https://github.com/ntpsec/ntpsec/blob/NTPsec_1_1_3/NEWS
• https://www.exploit-db.com/exploits/46175/
• https://dumpco.re/blog/ntpsec-bugs
• https://dumpco.re/bugs/ntpsec-oobread1
• https://github.com/ntpsec/ntpsec/blob/NTPsec_1_1_3/NEWS
• https://www.exploit-db.com/exploits/46175/

Get alerted when CVE-2019-6443 or the next vulnerability affects your stack