Ntpsec is a hardened, community-maintained implementation of the Network Time Protocol deployed across infrastructure and embedded systems where precise clock synchronization is critical. Despite a narrow product footprint, vulnerabilities in the ntpsec daemon skew strongly toward critical-severity outcomes and frequently acquire public exploit code, reflecting the memory-safety demands of a C-based network service exposed to untrusted time sources. The recurring weakness classes—out-of-bounds reads and writes, NULL pointer dereferences, and state-management flaws—are characteristic of parser and protocol-handling complexity in a long-lived codebase. Current severity and exploit availability are shown alongside this summary.
The number and severity of CVEs published that impact products developed by Ntpsec over time
Signals from CVEs in this vendor scope (7 CVEs).
7 CVEs · Highest risk first
| CVE | Published | CVSS | Risk | KEV | Exploit |
|---|---|---|---|---|---|
CVE-2019-6443CRITICAL 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. | Jan 16, 2019 | 9.1 | 83 | NO | YES |
CVE-2019-6444CRITICAL 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 | Jan 16, 2019 | 9.1 | 66 | NO | YES |
CVE-2019-6445MEDIUM An issue was discovered in NTPsec before 1.1.3. An authenticated attacker can cause a NULL pointer dereference and ntpd crash in ntp_control.c, related to ctl_getitem. | Jan 16, 2019 | 6.5 | 40 | NO | YES |
CVE-2019-6442MEDIUM An issue was discovered in NTPsec before 1.1.3. An authenticated attacker can write one byte out of bounds in ntpd via a malformed config request, related to config_remotely in ntp | Jan 16, 2019 | 6.5 | 32 | NO | YES |
CVE-2021-22212HIGH ntpkeygen can generate keys that ntpd fails to parse. NTPsec 1.2.0 allows ntpkeygen to generate keys with '#' characters. ntpd then either pads, shortens the key, or fails to load | Jun 8, 2021 | 7.4 | 24 | NO | NO |
CVE-2023-4012HIGH ntpd will crash if the server is not NTS-enabled (no certificate) and it receives an NTS-enabled client request (mode 3). | Aug 7, 2023 | 7.5 | 20 | NO | NO |
ntpd in NTP 4.2.8p3 and NTPsec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 relies on the underlying operating system to protect it from requests that impersonate reference clocks. Bec | Jan 27, 2017 | 3.7 | 13 | NO | NO |
Signals from CVEs in this vendor scope (7 CVEs).
An overview of all social media posts that mention a CVE ID that affects a product developed by Ntpsec.
Media articles that mention a CVE ID that affects a product developed by Ntpsec — matched by CVE ID, not by vendor name.