CVE-2016-9311
CVE-2016-9311 is a medium-severity vulnerability in Ntp with a CVSS 3.x base score of 5.9. 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-476.
Key facts
- Severity: Medium (CVSS 3.x base score 5.9)
- CVSS v2: 7.1
- EPSS exploit prediction: 11% (95th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-476
- Affected product: Ntp
- Published:
- Last modified:
Description
ntpd in NTP before 4.2.8p9, when the trap service is enabled, allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a crafted packet.
Frequently asked questions
- What is CVE-2016-9311?
- ntpd in NTP before 4.2.8p9, when the trap service is enabled, allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a crafted packet.
- How severe is CVE-2016-9311?
- CVE-2016-9311 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2016-9311 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-2016-9311?
- CVE-2016-9311 affects Ntp. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2016-9311?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2016-9311 published?
- CVE-2016-9311 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/NtpBug3119
- http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities
- http://www.securityfocus.com/bid/94444
- 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://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03885en_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:*:*:*:*:*:*
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Other CWE-476 (NULL Pointer Dereference) vulnerabilities
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- CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
- CVE-2026-46195 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building…
- CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
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Browse all CWE-476 (NULL Pointer Dereference) 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)