CVE-2019-6443

CRITICAL EXPLOITED NUCLEI

ntpsec < 1.1.3 - Stack-based Buffer Over-read in ntp_control.c

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2019-6443 has been observed exploited in the wild (reported by VulnCheck KEV). EIP tracks 1 public exploit from researchers including Magnus Klaaborg Stubman. A Nuclei detection template is also available.

AI-analyzed exploit summary This PoC exploits an out-of-bounds read vulnerability in ntpsec versions 1.1.1 and 1.1.2 by sending a maliciously crafted UDP packet to port 123. The exploit does not crash the target but demonstrates the vulnerability.

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.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Magnus Klaaborg Stubman · pythondoslinux
https://www.exploit-db.com/exploits/46175

This PoC exploits an out-of-bounds read vulnerability in ntpsec versions 1.1.1 and 1.1.2 by sending a maliciously crafted UDP packet to port 123. The exploit does not crash the target but demonstrates the vulnerability.

Classification
Working Poc 95%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: ntpsec 1.1.1, 1.1.2
No auth needed
Prerequisites: Network access to the target's NTP port (UDP 123)
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Nuclei Templates (1)

NTPsec > 1.1.3 - 'ctl_getitem' Out-of-Bounds Read
CRITICALVERIFIEDby pussycat0x,0x_Akoko
Shodan: ntpsec

References (4)

Core 4
Core References
Exploit, Third Party Advisory x_refsource_misc
https://dumpco.re/blog/ntpsec-bugs
Exploit, Third Party Advisory x_refsource_misc
https://dumpco.re/bugs/ntpsec-oobread1
Exploit, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/46175/

Scores

CVSS v3 9.1
EPSS 0.6688
EPSS Percentile 99.2%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Details

VulnCheck KEV 2025-10-20
CWE
CWE-125
Status published
Products (1)
ntpsec/ntpsec < 1.1.3
Published Jan 16, 2019
Tracked Since Feb 18, 2026