MEDIUM
ntp: Mode 6 unauthenticated trap information disclosure and DDoS vector
Published Jan 13, 2017
6.5
MEDIUMCVSS 3.0
EPSS 11.16%
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.
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.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
6.5 MEDIUM NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact Low
Integrity Impact None
Availability Impact Low
1 other source (Red Hat) ▾
4.8 MEDIUM Red Hat
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact Low
Integrity Impact None
Availability Impact Low
6.4 MEDIUM NVD
AV:N/AC:L/Au:N/C:P/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
11.16% 0.11162
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.11162
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 (28 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 11.16% (0.11162) | 95.82th | v5 (v2026.06.15) |
| Sep 22, 2026 | 11.16% (0.11162) | 95.75th | v5 (v2026.06.15) |
| Sep 21, 2026 | 12.88% (0.12881) | 96.18th | v5 (v2026.06.15) |
| Sep 6, 2026 | 11.16% (0.11162) | 95.65th | v5 (v2026.06.15) |
| Sep 5, 2026 | 12.88% (0.12881) | 96.10th | v5 (v2026.06.15) |
| Aug 30, 2026 | 11.16% (0.11162) | 95.63th | v5 (v2026.06.15) |
| Aug 28, 2026 | 12.88% (0.12881) | 96.08th | v5 (v2026.06.15) |
| Aug 24, 2026 | 11.16% (0.11162) | 95.60th | v5 (v2026.06.15) |
| Aug 23, 2026 | 12.88% (0.12881) | 96.07th | v5 (v2026.06.15) |
| Jun 15, 2026 | 11.16% (0.11162) | 95.37th | v5 (v2026.06.15) |
| May 4, 2026 | 3.96% (0.03956) | 88.40th | v4 (v2025.03.14) |
| Jan 18, 2026 | 1.92% (0.01921) | 82.91th | v4 (v2025.03.14) |
| Dec 28, 2025 | 7.01% (0.07012) | 91.16th | v4 (v2025.03.14) |
| Dec 27, 2025 | 8.71% (0.08709) | 92.23th | v4 (v2025.03.14) |
| Dec 20, 2025 | 7.01% (0.07012) | 91.14th | v4 (v2025.03.14) |
| Dec 9, 2025 | 8.71% (0.08709) | 92.16th | v4 (v2025.03.14) |
| Aug 10, 2025 | 14.52% (0.14524) | 94.16th | v4 (v2025.03.14) |
| Jun 19, 2025 | 8.71% (0.08709) | 92.01th | v4 (v2025.03.14) |
| Mar 30, 2025 | 13.74% (0.13738) | 93.67th | v4 (v2025.03.14) |
| Mar 29, 2025 | 17.22% (0.17216) | 91.75th | v4 (v2025.03.14) |
| Mar 19, 2025 | 14.52% (0.14524) | 93.64th | v4 (v2025.03.14) |
| Mar 17, 2025 | 12.46% (0.12457) | 93.37th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.81% (0.00806) | 82.42th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.81% (0.00806) | 81.15th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.81% (0.00806) | 79.06th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
Weaknesses (1)
References (16)
- 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/NtpBug3118 x_refsource_CONFIRMIssue TrackingMitigationVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities x_refsource_CONFIRMVendor Advisory
- http://www.securityfocus.com/bid/94452 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1037354 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2016-9310 Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa139 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1397319 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-2016-9310
- 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://usn.ubuntu.com/3707-2/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2016-9310
- 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.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jan 13, 2017
Updated Aug 6, 2024
Reserved Nov 14, 2016
Link CVE-2016-9310
CISA Vulnrichment
Updated n/a