CVE-2016-9310

CVE-2016-9310 is a medium-severity vulnerability in Ntp with a CVSS 3.x base score of 6.5. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-400.

Key facts

• Severity: Medium (CVSS 3.x base score 6.5)
• CVSS v2: 6.4
• EPSS exploit prediction: 11% (95th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-400
• Affected product: Ntp
• Published: 2017-01-13
• Last modified: 2026-06-17

Description

The control mode (mode 6) functionality in ntpd in NTP before 4.2.8p9 allows remote attackers to set or unset traps via a crafted control mode packet.

Frequently asked questions

What is CVE-2016-9310?

The control mode (mode 6) functionality in ntpd in NTP before 4.2.8p9 allows remote attackers to set or unset traps via a crafted control mode packet.

How severe is CVE-2016-9310?

CVE-2016-9310 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2016-9310 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-9310?

CVE-2016-9310 affects Ntp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-9310?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-9310 published?

CVE-2016-9310 was published on 2017-01-13 and last updated on 2026-06-17.

References

• http://nwtime.org/ntp428p9_release/
• http://rhn.redhat.com/errata/RHSA-2017-0252.html
• http://support.ntp.org/bin/view/Main/NtpBug3118
• http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities
• http://www.securityfocus.com/bid/94452
• http://www.securitytracker.com/id/1037354
• https://bto.bluecoat.com/security-advisory/sa139
• https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us
• https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc
• https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03799en_us
• https://usn.ubuntu.com/3707-2/
• https://www.kb.cert.org/vuls/id/633847

Affected products (1)

• cpe:2.3:a:ntp:ntp:*:p8:*:*:*:*:*:*

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…
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• 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…
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• 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…
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All CVEs affecting Ntp →

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• CVE-2025-24269 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.4. An app may be able to…
• CVE-2025-24264 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in Safari 18.4, iOS 18.4 and iPadOS 18.4,…
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Browse all CWE-400 (Uncontrolled Resource Consumption) 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)