ntp: incomplete checks in ntp_crypto.c
Published Aug 7, 2017
6.5
MEDIUMCVSS 3.1
EPSS 5.21%
Description
The crypto_xmit function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (crash). NOTE: This vulnerability exists due to an incomplete fix for CVE-2014-9750.
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 3
- 7.0
- 8.0
- 9.0
Configuration 4
- n/a
- n/a
- n/a
- n/a
Configuration 5
- 6.0
- 7.0
- 6.0
- 7.0
- 7.3
- 7.4
- 7.6
- 7.7
- 7.3
- 7.4
- 7.5
- 7.6
- 7.7
- 7.3
- 7.6
- 7.7
- 6.0
- 7.0
No data.
Red Hat Enterprise Linux 6
ntp-0:4.2.6p5-10.el6
Fixed · RHSA-2016:0780
Red Hat Enterprise Linux 7
ntp-0:4.2.6p5-25.el7
Fixed · RHSA-2016:2583
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 | Fixed | RHSA-2016:0780 |
| Red Hat Enterprise Linux 7 | ntp-0:4.2.6p5-25.el7 | Fixed | RHSA-2016:2583 |
| Red Hat Enterprise Linux 5 | ntp | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
Disable NTP autokey authentication by removing, or commenting out, all configuration directives beginning with the 'crypto' keyword in your ntp.conf file.
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 (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 5.21% (0.05207) | 92.23th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.21% (0.05207) | 91.39th | v5 (v2026.06.15) |
| Dec 14, 2025 | 1.85% (0.01854) | 82.52th | v4 (v2025.03.14) |
| Mar 30, 2025 | 0.80% (0.00797) | 71.78th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.38% (0.02385) | 75.00th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.66% (0.00663) | 69.47th | v4 (v2025.03.14) |
| Dec 17, 2024 | 2.19% (0.02185) | 89.04th | v3 (v2023.03.01) |
| Dec 12, 2024 | 1.15% (0.01146) | 85.42th | v3 (v2023.03.01) |
| Jul 10, 2024 | 1.62% (0.01617) | 87.60th | v3 (v2023.03.01) |
| May 28, 2024 | 1.52% (0.01520) | 87.00th | v3 (v2023.03.01) |
| Oct 3, 2023 | 1.36% (0.01359) | 84.65th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.21% (0.01210) | 83.07th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.65% (0.01649) | 75.99th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.65% (0.01649) | 75.95th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.65% (0.01649) | 73.90th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.65% (0.01649) | 52.77th | v2 (v2022.01.01) |
References (15)
- http://rhn.redhat.com/errata/RHSA-2016-0780.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-2583.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://support.ntp.org/bin/view/Main/NtpBug2899 x_refsource_CONFIRMVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner
- http://www.debian.org/security/2015/dsa-3388 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html x_refsource_CONFIRMThird Party Advisory
- http://www.securityfocus.com/bid/77286 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-2015-7702 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1274254 Issue Tracking
- https://github.com/ntp-project/ntp/blob/stable/NEWS#L11
- https://nvd.nist.gov/vuln/detail/CVE-2015-7702
- 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-2015-7702
Change history (0)
No recorded changes yet.