CVE-2017-6462

CVE-2017-6462 is a high-severity vulnerability in Ntp with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

• Severity: High (CVSS 3.x base score 7.8)
• CVSS v2: 4.6
• EPSS exploit prediction: 0% (39th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-119
• Affected product: Ntp
• Published: 2017-03-27
• Last modified: 2026-06-17

Description

Buffer overflow in the legacy Datum Programmable Time Server (DPTS) refclock driver in NTP before 4.2.8p10 and 4.3.x before 4.3.94 allows local users to have unspecified impact via a crafted /dev/datum device.

Frequently asked questions

What is CVE-2017-6462?

Buffer overflow in the legacy Datum Programmable Time Server (DPTS) refclock driver in NTP before 4.2.8p10 and 4.3.x before 4.3.94 allows local users to have unspecified impact via a crafted /dev/datum device.

How severe is CVE-2017-6462?

CVE-2017-6462 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-6462 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-6462?

CVE-2017-6462 primarily affects Ntp. In total, 95 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-6462?

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

When was CVE-2017-6462 published?

CVE-2017-6462 was published on 2017-03-27 and last updated on 2026-06-17.

References

• http://support.ntp.org/bin/view/Main/NtpBug3388
• http://support.ntp.org/bin/view/Main/SecurityNotice#March_2017_ntp_4_2_8p10_NTP_Secu
• http://www.securityfocus.com/bid/97045
• http://www.securitytracker.com/id/1038123
• https://access.redhat.com/errata/RHSA-2017:3071
• https://access.redhat.com/errata/RHSA-2018:0855
• https://security.FreeBSD.org/advisories/FreeBSD-SA-17:03.ntp.asc
• https://support.apple.com/HT208144
• https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us
• https://usn.ubuntu.com/3707-2/

Affected products (95)

• cpe:2.3:a:ntp:ntp:4.2.8:p9:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.1:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.2:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.3:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.4:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.5:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.6:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.7:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.8:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.9:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.10:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.11:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.12:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.13:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.14:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.15:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.16:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.17:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.18:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.19:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.20:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.21:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.22:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.23:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.24:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.25:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.26:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.27:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.28:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.29:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.30:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.31:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.32:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.33:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.34:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.35:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.36:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.37:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.38:*:*:*:*:*:*:*

More vulnerabilities in Ntp

• CVE-2018-12327 — Critical (CVSS 9.8): Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker to achieve code execution or…
• CVE-2018-7183 — Critical (CVSS 9.8): Buffer overflow in the decodearr function in ntpq in ntp 4.2.8p6 through 4.2.8p10 allows remote attackers to execute…
• CVE-2015-7871 — Critical (CVSS 9.8): Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass…
• CVE-2015-7853 — Critical (CVSS 9.8): The datalen parameter in the refclock driver in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote…
• CVE-2015-7705 — Critical (CVSS 9.8): The rate limiting feature in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to have unspecified…
• CVE-2015-7854 — High (CVSS 8.8): Buffer overflow in the password management functionality in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows…

All CVEs affecting Ntp →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

• CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
• CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…
• CVE-2025-1866 — Critical (CVSS 10.0): Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows…
• CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
• CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
• CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 197.248.207.139 (ipv4-addr)
• 135.129.128.247 (ipv4-addr)
• 119.201.59.224 (ipv4-addr)
• 125.212.244.35 (ipv4-addr)
• 202.29.220.126 (ipv4-addr)
• 93.42.227.251 (ipv4-addr)
• 82.209.191.11 (ipv4-addr)
• 119.204.60.250 (ipv4-addr)