ntp: Null pointer dereference when trap service is enabled
Published Jan 13, 2017
5.9
MEDIUMCVSS 3.0
EPSS 11.17%
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.
Affected products
No data.
No data.
Red Hat Enterprise Linux 6
ntp-0:4.2.6p5-10.el6_8.2
Fixed · RHSA-2017:0252
Red Hat Enterprise Linux 7
ntp-0:4.2.6p5-25.el7_3.1
Fixed · RHSA-2017:0252
Red Hat Enterprise Linux 5
ntp
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | ntp-0:4.2.6p5-10.el6_8.2 | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux 7 | ntp-0:4.2.6p5-25.el7_3.1 | Fixed | RHSA-2017:0252 |
| Red Hat Enterprise Linux 5 | ntp | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
Use "restrict default noquery ..." in your ntp.conf file. Only allow mode 6 queries from trusted networks and hosts.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:M/Au:N/C:N/I:N/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (25 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 11.17% (0.11174) | 95.83th | v5 (v2026.06.15) |
| Sep 22, 2026 | 11.17% (0.11174) | 95.75th | v5 (v2026.06.15) |
| Sep 21, 2026 | 12.96% (0.12963) | 96.20th | v5 (v2026.06.15) |
| Sep 6, 2026 | 11.17% (0.11174) | 95.65th | v5 (v2026.06.15) |
| Sep 5, 2026 | 12.96% (0.12963) | 96.12th | v5 (v2026.06.15) |
| Aug 30, 2026 | 11.17% (0.11174) | 95.63th | v5 (v2026.06.15) |
| Aug 28, 2026 | 12.96% (0.12963) | 96.10th | v5 (v2026.06.15) |
| Aug 24, 2026 | 11.17% (0.11174) | 95.60th | v5 (v2026.06.15) |
| Aug 23, 2026 | 12.96% (0.12963) | 96.09th | v5 (v2026.06.15) |
| Jun 15, 2026 | 11.17% (0.11174) | 95.37th | v5 (v2026.06.15) |
| Feb 18, 2026 | 4.78% (0.04785) | 89.23th | v4 (v2025.03.14) |
| Aug 10, 2025 | 18.26% (0.18259) | 94.92th | v4 (v2025.03.14) |
| Jun 19, 2025 | 19.44% (0.19437) | 95.07th | v4 (v2025.03.14) |
| Mar 30, 2025 | 18.26% (0.18259) | 94.68th | v4 (v2025.03.14) |
| Mar 29, 2025 | 20.65% (0.20648) | 92.81th | v4 (v2025.03.14) |
| Mar 17, 2025 | 18.26% (0.18259) | 94.70th | v4 (v2025.03.14) |
| Dec 17, 2024 | 10.71% (0.10712) | 95.05th | v3 (v2023.03.01) |
| Apr 15, 2024 | 2.17% (0.02168) | 89.18th | v3 (v2023.03.01) |
| Jan 26, 2024 | 1.92% (0.01922) | 87.37th | v3 (v2023.03.01) |
| Dec 17, 2023 | 1.12% (0.01116) | 82.90th | v3 (v2023.03.01) |
| Nov 4, 2023 | 1.08% (0.01080) | 82.72th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.90% (0.00904) | 80.29th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.78% (0.03779) | 85.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.78% (0.03779) | 84.01th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.78% (0.03779) | 67.21th | v2 (v2022.01.01) |
References (17)
- http://nwtime.org/ntp428p9_release/ x_refsource_CONFIRMRelease NotesVendor Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0252.html vendor-advisoryx_refsource_REDHAT
- http://support.ntp.org/bin/view/Main/NtpBug3119 x_refsource_CONFIRMIssue TrackingMitigationVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities x_refsource_CONFIRMVendor Advisory
- http://www.securityfocus.com/bid/94444 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1037354 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2016-9311 Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa139 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1398350 Issue Tracking
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2016-9311
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc vendor-advisoryx_refsource_FREEBSD
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03799en_us x_refsource_CONFIRM
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03885en_us x_refsource_CONFIRM
- https://usn.ubuntu.com/3707-2/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2016-9311
- https://www.kb.cert.org/vuls/id/633847 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
Change history (0)
No recorded changes yet.