MEDIUM
ntp: Zero Origin timestamp regression
Published Jan 13, 2017
5.3
MEDIUMCVSS 3.0
EPSS 8.71%
Description
NTP before 4.2.8p9 allows remote attackers to bypass the origin timestamp protection mechanism via an origin timestamp of zero. NOTE: this vulnerability exists because of a CVE-2015-8138 regression.
Affected products
No data.
No data.
Red Hat Enterprise Linux 5
ntp
Not affected
Red Hat Enterprise Linux 6
ntp
Not affected
Red Hat Enterprise Linux 7
ntp
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | ntp | Not affected | n/a |
| Red Hat Enterprise Linux 6 | ntp | Not affected | n/a |
| Red Hat Enterprise Linux 7 | ntp | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of ntp as shipped with Red Hat Enterprise Linux 5, 6 and 7.
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:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact Low
Availability Impact None
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:P/A:N
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
8.71% 0.08710
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.08710
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 (24 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 8.71% (0.08710) | 94.98th | v5 (v2026.06.15) |
| Sep 22, 2026 | 8.71% (0.08710) | 94.90th | v5 (v2026.06.15) |
| Sep 21, 2026 | 10.38% (0.10376) | 95.58th | v5 (v2026.06.15) |
| Sep 6, 2026 | 8.71% (0.08710) | 94.78th | v5 (v2026.06.15) |
| Sep 5, 2026 | 10.38% (0.10376) | 95.48th | v5 (v2026.06.15) |
| Aug 30, 2026 | 8.71% (0.08710) | 94.75th | v5 (v2026.06.15) |
| Aug 28, 2026 | 10.38% (0.10376) | 95.45th | v5 (v2026.06.15) |
| Aug 24, 2026 | 8.71% (0.08710) | 94.72th | v5 (v2026.06.15) |
| Aug 23, 2026 | 10.38% (0.10376) | 95.44th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.64% (0.08640) | 94.39th | v5 (v2026.06.15) |
| Dec 28, 2025 | 18.62% (0.18621) | 95.05th | v4 (v2025.03.14) |
| Dec 27, 2025 | 19.91% (0.19912) | 95.30th | v4 (v2025.03.14) |
| Dec 13, 2025 | 18.62% (0.18621) | 95.03th | v4 (v2025.03.14) |
| Aug 10, 2025 | 19.91% (0.19912) | 95.21th | v4 (v2025.03.14) |
| Mar 30, 2025 | 15.65% (0.15654) | 94.13th | v4 (v2025.03.14) |
| Mar 29, 2025 | 14.54% (0.14537) | 90.78th | v4 (v2025.03.14) |
| Mar 24, 2025 | 15.65% (0.15654) | 94.11th | v4 (v2025.03.14) |
| Mar 17, 2025 | 9.96% (0.09957) | 92.46th | v4 (v2025.03.14) |
| Dec 17, 2024 | 2.22% (0.02224) | 89.16th | v3 (v2023.03.01) |
| Apr 17, 2024 | 1.20% (0.01196) | 84.97th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.20% (0.01196) | 82.96th | 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 (29)
- 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://packetstormsecurity.com/files/140240/FreeBSD-Security-Advisory-FreeBSD-SA-16.39.ntp.html x_refsource_MISC
- http://support.ntp.org/bin/view/Main/NtpBug3102 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/94454 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-2016-7431 Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa139 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1397331 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://nvd.nist.gov/vuln/detail/CVE-2016-7431
- 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&docId=emr_na-hpesbhf03883en_us x_refsource_CONFIRM
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en&docId=emr_na-hpesbhf03899en_us x_refsource_CONFIRM
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03883en_us x_refsource_CONFIRM
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03899en_us x_refsource_CONFIRM
- 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-2017-223/ x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2016-7431
- 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-2016-7431
CISA Vulnrichment
Updated n/a