ntp: remote configuration denial of service vulnerability
Published Aug 7, 2017
6.5
MEDIUMCVSS 3.1
EPSS 4.97%
Description
ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to cause a denial of service (infinite loop or crash) by pointing the key file at the log file.
Affected products
No data.
Configuration 1
- ≥ 4.2.0 · < 4.2.8
- ≥ 4.3.0 · < 4.3.77
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
Configuration 2
- 7.0
- 8.0
- 9.0
Configuration 3
- n/a
- n/a
- n/a
- n/a
- n/a
No data.
Red Hat Enterprise Linux 5
ntp
Will not fix
Red Hat Enterprise Linux 6
ntp
Will not fix
Red Hat Enterprise Linux 7
ntp
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | ntp | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | ntp | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | ntp | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:S/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 (18 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.97% (0.04973) | 91.93th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.97% (0.04973) | 91.05th | v5 (v2026.06.15) |
| May 1, 2026 | 2.64% (0.02637) | 85.76th | v4 (v2025.03.14) |
| Dec 28, 2025 | 4.35% (0.04346) | 88.56th | v4 (v2025.03.14) |
| Dec 27, 2025 | 2.80% (0.02799) | 85.73th | v4 (v2025.03.14) |
| Dec 13, 2025 | 4.18% (0.04176) | 88.31th | v4 (v2025.03.14) |
| Jun 25, 2025 | 2.60% (0.02600) | 84.93th | v4 (v2025.03.14) |
| Mar 30, 2025 | 1.37% (0.01371) | 78.46th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.84% (0.02843) | 77.01th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.37% (0.01371) | 78.92th | v4 (v2025.03.14) |
| Dec 17, 2024 | 10.76% (0.10756) | 95.06th | v3 (v2023.03.01) |
| Dec 12, 2024 | 0.81% (0.00810) | 82.46th | v3 (v2023.03.01) |
| Feb 14, 2024 | 0.86% (0.00863) | 81.79th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.86% (0.00863) | 79.79th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.23% (0.01232) | 67.28th | v2 (v2022.01.01) |
| Dec 23, 2022 | 1.23% (0.01232) | 66.86th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.23% (0.01232) | 64.85th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.23% (0.01232) | 41.02th | v2 (v2022.01.01) |
References (12)
- http://support.ntp.org/bin/view/Main/NtpBug2917 x_refsource_CONFIRMPatchVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner
- http://talosintel.com/reports/TALOS-2015-0055/
- http://www.debian.org/security/2015/dsa-3388 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.securityfocus.com/bid/77279 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1033951 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2015-7850 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1274258 x_refsource_CONFIRMIssue TrackingThird Party AdvisoryVDB Entry
- https://nvd.nist.gov/vuln/detail/CVE-2015-7850
- https://security.gentoo.org/glsa/201607-15 vendor-advisoryx_refsource_GENTOOThird Party AdvisoryVDB Entry
- https://security.netapp.com/advisory/ntap-20171004-0001/ x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2015-7850
Change history (0)
No recorded changes yet.