HIGH
ntp: off-path denial of service on authenticated broadcast mode
Published Jan 30, 2017
7.5
HIGHCVSS 3.0
EPSS 11.89%
Description
NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to cause a denial of service (client-server association tear down) by sending broadcast packets with invalid authentication to a broadcast client.
Affected products
No data.
OR
- ≤ 4.2.8
- 4.3.0
- 4.3.1
- 4.3.2
- 4.3.3
- 4.3.4
- 4.3.5
- 4.3.6
- 4.3.7
- 4.3.8
- 4.3.10
- 4.3.11
- 4.3.12
- 4.3.13
- 4.3.14
- 4.3.15
- 4.3.16
- 4.3.17
- 4.3.18
- 4.3.19
- 4.3.20
- 4.3.21
- 4.3.22
- 4.3.23
- 4.3.24
- 4.3.25
- 4.3.26
- 4.3.27
- 4.3.28
- 4.3.29
- 4.3.30
- 4.3.31
- 4.3.32
- 4.3.33
- 4.3.34
- 4.3.35
- 4.3.36
- 4.3.37
- 4.3.38
- 4.3.39
- 4.3.40
- 4.3.41
- 4.3.42
- 4.3.43
- 4.3.44
- 4.3.45
- 4.3.46
- 4.3.47
- 4.3.48
- 4.3.49
- 4.3.50
- 4.3.51
- 4.3.52
- 4.3.53
- 4.3.54
- 4.3.55
- 4.3.56
- 4.3.57
- 4.3.58
- 4.3.59
- 4.3.60
- 4.3.61
- 4.3.62
- 4.3.63
- 4.3.64
- 4.3.65
- 4.3.66
- 4.3.67
- 4.3.68
- 4.3.69
- 4.3.70
- 4.3.71
- 4.3.72
- 4.3.73
- 4.3.74
- 4.3.75
- 4.3.76
- 4.3.77
- 4.3.78
- 4.3.79
- 4.3.80
- 4.3.81
- 4.3.82
- 4.3.83
- 4.3.84
- 4.3.85
- 4.3.86
- 4.3.87
- 4.3.88
- 4.3.89
No data.
Red Hat Enterprise Linux 6
ntp-0:4.2.6p5-10.el6.1
Fixed · RHSA-2016:1141
Red Hat Enterprise Linux 6.7 Extended Update Support
ntp-0:4.2.6p5-5.el6_7.5
Fixed · RHSA-2016:1552
Red Hat Enterprise Linux 7
ntp-0:4.2.6p5-22.el7_2.2
Fixed · RHSA-2016:1141
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.el6.1 | Fixed | RHSA-2016:1141 |
| Red Hat Enterprise Linux 6.7 Extended Update Support | ntp-0:4.2.6p5-5.el6_7.5 | Fixed | RHSA-2016:1552 |
| Red Hat Enterprise Linux 7 | ntp-0:4.2.6p5-22.el7_2.2 | Fixed | RHSA-2016:1141 |
| 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 statement
This issue affects the versions of ntp as shipped with Red Hat Enterprise Linux 5, 6, and 7. Red Hat Product Security has rated this issue as having Moderate security impact. A future update may address this issue in Red Hat Enterprise Linux 6 and 7. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Red Hat mitigation
Do not use NTP's broadcast mode by not configuring the "broadcast" directive in the ntp.conf file.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
7.5 HIGH NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
11.89% 0.11887
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.11887
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 (33 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 11.89% (0.11887) | 95.98th | v5 (v2026.06.15) |
| Sep 22, 2026 | 11.89% (0.11887) | 95.91th | v5 (v2026.06.15) |
| Sep 21, 2026 | 10.82% (0.10823) | 95.71th | v5 (v2026.06.15) |
| Sep 6, 2026 | 11.89% (0.11887) | 95.82th | v5 (v2026.06.15) |
| Sep 5, 2026 | 10.82% (0.10823) | 95.62th | v5 (v2026.06.15) |
| Aug 30, 2026 | 11.89% (0.11887) | 95.80th | v5 (v2026.06.15) |
| Aug 28, 2026 | 10.82% (0.10823) | 95.59th | v5 (v2026.06.15) |
| Aug 24, 2026 | 11.89% (0.11887) | 95.77th | v5 (v2026.06.15) |
| Aug 23, 2026 | 10.82% (0.10823) | 95.58th | v5 (v2026.06.15) |
| Jun 15, 2026 | 11.98% (0.11983) | 95.58th | v5 (v2026.06.15) |
| Jan 18, 2026 | 4.23% (0.04229) | 88.44th | v4 (v2025.03.14) |
| Jan 14, 2026 | 16.20% (0.16205) | 94.59th | v4 (v2025.03.14) |
| Dec 15, 2025 | 19.21% (0.19215) | 95.14th | v4 (v2025.03.14) |
| Dec 13, 2025 | 21.01% (0.21010) | 95.44th | v4 (v2025.03.14) |
| Aug 10, 2025 | 19.10% (0.19095) | 95.08th | v4 (v2025.03.14) |
| Jun 3, 2025 | 22.09% (0.22091) | 95.49th | v4 (v2025.03.14) |
| Mar 30, 2025 | 18.76% (0.18759) | 94.78th | v4 (v2025.03.14) |
| Mar 29, 2025 | 23.38% (0.23379) | 93.49th | v4 (v2025.03.14) |
| Mar 28, 2025 | 18.76% (0.18759) | 94.79th | v4 (v2025.03.14) |
| Mar 27, 2025 | 23.38% (0.23379) | 95.19th | v4 (v2025.03.14) |
| Mar 20, 2025 | 18.76% (0.18759) | 94.82th | v4 (v2025.03.14) |
| Mar 19, 2025 | 23.38% (0.23379) | 95.28th | v4 (v2025.03.14) |
| Mar 17, 2025 | 18.76% (0.18759) | 94.80th | v4 (v2025.03.14) |
| Dec 17, 2024 | 39.14% (0.39140) | 97.27th | v3 (v2023.03.01) |
| May 2, 2024 | 9.73% (0.09732) | 94.74th | v3 (v2023.03.01) |
| Feb 12, 2024 | 8.18% (0.08175) | 94.12th | v3 (v2023.03.01) |
| Jan 3, 2024 | 7.06% (0.07057) | 93.31th | v3 (v2023.03.01) |
| Nov 21, 2023 | 6.85% (0.06850) | 93.18th | v3 (v2023.03.01) |
| May 6, 2023 | 4.74% (0.04741) | 91.44th | v3 (v2023.03.01) |
| Mar 7, 2023 | 4.68% (0.04679) | 91.34th | 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 (2)
References (35)
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.html vendor-advisoryx_refsource_FEDORAThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176434.html vendor-advisoryx_refsource_FEDORAThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-1552.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-2583.html vendor-advisoryx_refsource_REDHAT
- http://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_NTP_4_2_8p7_Security x_refsource_CONFIRMVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p6_Securit
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160127-ntpd vendor-advisoryx_refsource_CISCOThird Party Advisory
- http://www.debian.org/security/2016/dsa-3629 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/81816 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1034782 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- http://www.talosintel.com/reports/TALOS-2016-0076/
- http://www.ubuntu.com/usn/USN-3096-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://access.redhat.com/errata/RHSA-2016:1141 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2015-7979 Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa113 x_refsource_CONFIRMThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1300271 Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf x_refsource_CONFIRM
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03750en_us x_refsource_CONFIRM
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03766en_us x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2015-7979
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:09.ntp.asc vendor-advisoryx_refsource_FREEBSD
- https://security.gentoo.org/glsa/201607-15 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://security.netapp.com/advisory/ntap-20171031-0001/ x_refsource_CONFIRM
- https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11 x_refsource_MISC
- https://www.cve.org/CVERecord?id=CVE-2015-7979
- https://www.kb.cert.org/vuls/id/718152 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 30, 2017
Updated Aug 6, 2024
Reserved Oct 23, 2015
Link CVE-2015-7979
CISA Vulnrichment
Updated n/a