MEDIUM
ntp: Broken initial sync calculations regression
Published Jan 13, 2017
5.3
MEDIUMCVSS 3.0
EPSS 9.84%
Description
NTP before 4.2.8p9 does not properly perform the initial sync calculations, which allows remote attackers to unspecified impact via unknown vectors, related to a "root distance that did not include the peer dispersion."
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
Not affected
| 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 | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
5.3 MEDIUM NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact Low
1 other source (Red Hat) ▾
2.9 LOW Red Hat
CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector Local
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact Low
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
9.84% 0.09841
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.09841
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 (18 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 9.84% (0.09841) | 95.42th | v5 (v2026.06.15) |
| Jun 15, 2026 | 9.76% (0.09762) | 94.90th | v5 (v2026.06.15) |
| Jan 18, 2026 | 6.85% (0.06848) | 91.09th | v4 (v2025.03.14) |
| Dec 28, 2025 | 29.51% (0.29508) | 96.44th | v4 (v2025.03.14) |
| Dec 27, 2025 | 28.28% (0.28277) | 96.36th | v4 (v2025.03.14) |
| Dec 13, 2025 | 29.51% (0.29508) | 96.43th | v4 (v2025.03.14) |
| Dec 9, 2025 | 28.28% (0.28277) | 96.31th | v4 (v2025.03.14) |
| Aug 10, 2025 | 36.23% (0.36227) | 96.96th | v4 (v2025.03.14) |
| Mar 30, 2025 | 28.28% (0.28277) | 96.09th | v4 (v2025.03.14) |
| Mar 29, 2025 | 32.43% (0.32428) | 95.06th | v4 (v2025.03.14) |
| Mar 24, 2025 | 28.28% (0.28277) | 96.06th | v4 (v2025.03.14) |
| Mar 17, 2025 | 30.09% (0.30089) | 96.27th | v4 (v2025.03.14) |
| Dec 17, 2024 | 5.15% (0.05154) | 92.86th | v3 (v2023.03.01) |
| Dec 12, 2024 | 2.41% (0.02413) | 90.32th | v3 (v2023.03.01) |
| Mar 7, 2023 | 2.41% (0.02413) | 88.21th | v3 (v2023.03.01) |
| Mar 6, 2023 | 4.36% (0.04358) | 88.02th | v2 (v2022.01.01) |
| Apr 1, 2022 | 4.36% (0.04358) | 86.83th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.36% (0.04358) | 70.59th | v2 (v2022.01.01) |
Weaknesses (1)
References (28)
- http://lists.opensuse.org/opensuse-updates/2016-12/msg00153.html vendor-advisoryx_refsource_SUSE
- 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/NtpBug3067 x_refsource_CONFIRMIssue TrackingMitigationVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities x_refsource_CONFIRMVendor Advisory
- http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20171129-01-ntpd-en x_refsource_CONFIRM
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html x_refsource_CONFIRM
- http://www.securityfocus.com/archive/1/539955/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/archive/1/540254/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/archive/1/archive/1/539955/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/archive/1/archive/1/540254/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/bid/94455 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1037354 vdb-entryx_refsource_SECTRACK
- http://www.ubuntu.com/usn/USN-3349-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2016-7433 Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa139 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1397347 Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf x_refsource_CONFIRM
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us x_refsource_CONFIRM
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMSYVQMMF37MANYEO7KBHOPSC74EKGN/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PABKEYX6ABBFJZGMXKH57X756EJUDS3C/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U5E3XBBCK5IXOLDAH2E4M3QKIYIHUMMP/ vendor-advisoryx_refsource_FEDORA
- https://nvd.nist.gov/vuln/detail/CVE-2016-7433
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc vendor-advisoryx_refsource_FREEBSD
- https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11 x_refsource_MISC
- https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2017-227 x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2016-7433
- 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 Sep 9, 2016
Link CVE-2016-7433
CISA Vulnrichment
Updated n/a