ntp: Broadcast Mode Replay Prevention DoS
Published Jan 13, 2017
4.3
MEDIUMCVSS 3.0
EPSS 3.94%
Description
The broadcast mode replay prevention functionality in ntpd in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (reject broadcast mode packets) via a crafted broadcast mode packet.
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
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
AV:A/AC:L/Au:N/C:N/I:N/A:P
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 (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.94% (0.03939) | 90.06th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.91% (0.03907) | 88.89th | v5 (v2026.06.15) |
| Dec 28, 2025 | 5.30% (0.05301) | 89.69th | v4 (v2025.03.14) |
| Dec 27, 2025 | 6.71% (0.06715) | 90.99th | v4 (v2025.03.14) |
| Dec 13, 2025 | 5.30% (0.05301) | 89.66th | v4 (v2025.03.14) |
| Aug 10, 2025 | 6.71% (0.06715) | 90.86th | v4 (v2025.03.14) |
| Mar 17, 2025 | 4.55% (0.04548) | 88.45th | v4 (v2025.03.14) |
| Dec 17, 2024 | 3.21% (0.03210) | 91.00th | v3 (v2023.03.01) |
| Apr 15, 2024 | 1.00% (0.00995) | 83.36th | v3 (v2023.03.01) |
| Jan 26, 2024 | 0.88% (0.00880) | 80.73th | v3 (v2023.03.01) |
| Nov 4, 2023 | 0.75% (0.00749) | 78.91th | v3 (v2023.03.01) |
| May 31, 2023 | 0.70% (0.00701) | 77.48th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.48% (0.00478) | 72.02th | 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) |
References (16)
- http://nwtime.org/ntp428p9_release/ x_refsource_CONFIRMRelease NotesVendor Advisory
- http://support.ntp.org/bin/view/Main/NtpBug3114 x_refsource_CONFIRMIssue TrackingMitigationVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities x_refsource_CONFIRMVendor Advisory
- http://www.securityfocus.com/bid/94447 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1037354 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2016-7427 Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa139 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1397329 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-2016-7427
- 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-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://usn.ubuntu.com/3707-2/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2016-7427
- 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.