ntpd in NTP before 4.2.8p9, when the trap service is enabled, allows remote attackers to…
Priority MEDIUM 40CWE-476Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 16 fixed, 1 without a fix
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-476.
Summary
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.
Why it matters now
EPSS 0.11085 95th percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 16 fixed, 1 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:ntp:ntp:*:p8:*:*:*:*:*:* | up to 4.2.8 | Vulnerable | NTP Project |
- cpe:2.3:a:ntp:ntp:*:p8:*:*:*:*:*:* Versions up to 4.2.8 Vulnerable ·NTP Project
Remediation
Red Hat 1 advisory
- RHSA-2017:0252 Released 2017-02-06 · Red Hat rating Moderatentp security update
- Red Hat Enterprise Linux Client (v. 7) ntp-4.2.6p5-25.el7_3.1, ntpdate-4.2.6p5-25.el7_3.1
- Red Hat Enterprise Linux Client Optional (v. 7) ntp-doc-4.2.6p5-25.el7_3.1, ntp-perl-4.2.6p5-25.el7_3.1, sntp-4.2.6p5-25.el7_3.1
- Red Hat Enterprise Linux ComputeNode (v. 7) ntp-4.2.6p5-25.el7_3.1, ntpdate-4.2.6p5-25.el7_3.1
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) ntp-doc-4.2.6p5-25.el7_3.1, ntp-perl-4.2.6p5-25.el7_3.1, sntp-4.2.6p5-25.el7_3.1
- Red Hat Enterprise Linux Desktop (v. 6) ntp-4.2.6p5-10.el6_8.2, ntpdate-4.2.6p5-10.el6_8.2
- Red Hat Enterprise Linux Desktop Optional (v. 6) ntp-doc-4.2.6p5-10.el6_8.2, ntp-perl-4.2.6p5-10.el6_8.2
- Red Hat Enterprise Linux HPC Node (v. 6) ntp-4.2.6p5-10.el6_8.2, ntpdate-4.2.6p5-10.el6_8.2
- Red Hat Enterprise Linux HPC Node Optional (v. 6) ntp-doc-4.2.6p5-10.el6_8.2, ntp-perl-4.2.6p5-10.el6_8.2
- Red Hat Enterprise Linux Server (v. 6) ntp-4.2.6p5-10.el6_8.2, ntpdate-4.2.6p5-10.el6_8.2
- Red Hat Enterprise Linux Server (v. 7) ntp-4.2.6p5-25.el7_3.1, ntpdate-4.2.6p5-25.el7_3.1
- Red Hat Enterprise Linux Server Optional (v. 6) ntp-doc-4.2.6p5-10.el6_8.2, ntp-perl-4.2.6p5-10.el6_8.2
- Red Hat Enterprise Linux Server Optional (v. 7) ntp-doc-4.2.6p5-25.el7_3.1, ntp-perl-4.2.6p5-25.el7_3.1, sntp-4.2.6p5-25.el7_3.1
- Red Hat Enterprise Linux Workstation (v. 6) ntp-4.2.6p5-10.el6_8.2, ntpdate-4.2.6p5-10.el6_8.2
- Red Hat Enterprise Linux Workstation (v. 7) ntp-4.2.6p5-25.el7_3.1, ntpdate-4.2.6p5-25.el7_3.1
- Red Hat Enterprise Linux Workstation Optional (v. 6) ntp-doc-4.2.6p5-10.el6_8.2, ntp-perl-4.2.6p5-10.el6_8.2
- Red Hat Enterprise Linux Workstation Optional (v. 7) ntp-doc-4.2.6p5-25.el7_3.1, ntp-perl-4.2.6p5-25.el7_3.1, sntp-4.2.6p5-25.el7_3.1
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux ComputeNode (v. 7) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux HPC Node (v. 6) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2017:0252 |
Timeline
- 2026-10-02 Threatist record created from CVE-2016-9311
- 2026-10-03 Alias added: GHSA-fwm3-rx8m-qmv5
References
Advisory 7
Other 4
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us
- https://bto.bluecoat.com/security-advisory/sa139
- 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
More NTP Project Ntp vulnerabilities
- TI-2015-06541 Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows… CVSS 3.1CRITICAL 9.8
- TI-2014-07543 Multiple stack-based buffer overflows in ntpd in NTP before 4.2.8 allow remote attackers… CVSS 2.0HIGH 7.5
- TI-2013-04524 The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote… CVSS 2.0MEDIUM 5.0
- TI-2016-06333 The read_mru_list function in NTP before 4.2.8p9 allows remote attackers to cause a… CVSS 3.1HIGH 7.5
- TI-2018-08842 Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker… CVSS 3.0CRITICAL 9.8
- TI-2016-04280 ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon… CVSS 3.1HIGH 7.5
Sources
- CVE-2016-9311 · CVE Program
- CVE-2016-9311 · NVD
- FIRST EPSS
- GHSA-fwm3-rx8m-qmv5 · GitHub Advisory Database · CC BY 4.0
- CVE-2016-9311 · Red Hat security data · CC BY 4.0
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