ntp: Attack on interface selection
Published Jan 13, 2017
3.7
LOWCVSS 3.0
EPSS 7.42%
Description
NTP before 4.2.8p9 changes the peer structure to the interface it receives the response from a source, which allows remote attackers to cause a denial of service (prevent communication with a source) by sending a response for a source to an interface the source does not use.
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
If you are going to configure your OS to disable source address checks, also configure your firewall configuration to control what interfaces can receive packets from what networks.
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:L
AV:N/AC:M/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 2, 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 (31 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 7.42% (0.07422) | 94.27th | v5 (v2026.06.15) |
| Sep 22, 2026 | 7.42% (0.07422) | 94.17th | v5 (v2026.06.15) |
| Sep 21, 2026 | 9.53% (0.09533) | 95.29th | v5 (v2026.06.15) |
| Sep 6, 2026 | 7.42% (0.07422) | 94.03th | v5 (v2026.06.15) |
| Sep 5, 2026 | 9.53% (0.09533) | 95.19th | v5 (v2026.06.15) |
| Aug 30, 2026 | 7.42% (0.07422) | 94.00th | v5 (v2026.06.15) |
| Aug 28, 2026 | 9.53% (0.09533) | 95.16th | v5 (v2026.06.15) |
| Aug 24, 2026 | 7.42% (0.07422) | 93.96th | v5 (v2026.06.15) |
| Aug 23, 2026 | 9.53% (0.09533) | 95.14th | v5 (v2026.06.15) |
| Jun 15, 2026 | 7.42% (0.07422) | 93.64th | v5 (v2026.06.15) |
| Jan 18, 2026 | 5.21% (0.05213) | 89.63th | v4 (v2025.03.14) |
| Dec 28, 2025 | 24.15% (0.24154) | 95.88th | v4 (v2025.03.14) |
| Dec 27, 2025 | 28.47% (0.28473) | 96.38th | v4 (v2025.03.14) |
| Dec 20, 2025 | 24.15% (0.24154) | 95.87th | v4 (v2025.03.14) |
| Dec 13, 2025 | 29.71% (0.29708) | 96.45th | v4 (v2025.03.14) |
| Dec 9, 2025 | 28.47% (0.28473) | 96.33th | v4 (v2025.03.14) |
| Aug 10, 2025 | 26.61% (0.26612) | 96.12th | v4 (v2025.03.14) |
| Jun 19, 2025 | 28.47% (0.28473) | 96.26th | v4 (v2025.03.14) |
| Mar 30, 2025 | 19.25% (0.19250) | 94.88th | v4 (v2025.03.14) |
| Mar 29, 2025 | 22.62% (0.22616) | 93.30th | v4 (v2025.03.14) |
| Mar 19, 2025 | 26.61% (0.26612) | 95.70th | v4 (v2025.03.14) |
| Mar 17, 2025 | 23.39% (0.23395) | 95.51th | v4 (v2025.03.14) |
| Dec 17, 2024 | 3.11% (0.03113) | 90.85th | v3 (v2023.03.01) |
| Apr 15, 2024 | 1.92% (0.01923) | 88.41th | v3 (v2023.03.01) |
| Jan 26, 2024 | 1.70% (0.01703) | 86.46th | v3 (v2023.03.01) |
| Dec 17, 2023 | 1.19% (0.01188) | 83.50th | v3 (v2023.03.01) |
| Nov 4, 2023 | 1.15% (0.01151) | 83.28th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.03% (0.01028) | 81.53th | 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 (14)
- 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/NtpBug3072 x_refsource_CONFIRMIssue TrackingMitigationVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities x_refsource_CONFIRMVendor Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/94453 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1037354 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2016-7429 Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa139 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1397341 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-2016-7429
- https://www.cve.org/CVERecord?id=CVE-2016-7429
- 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.