HIGH
ntp: MITM attacker can force ntpd to make a step larger than the panic threshold
Published Jul 21, 2017
7.5
HIGHCVSS 3.0
EPSS 9.13%
Description
The panic_gate check in NTP before 4.2.8p5 is only re-enabled after the first change to the system clock that was greater than 128 milliseconds by default, which allows remote attackers to set NTP to an arbitrary time when started with the -g option, or to alter the time by up to 900 seconds otherwise by responding to an unspecified number of requests from trusted sources, and leveraging a resulting denial of service (abort and restart).
Affected products
No data.
Configuration 1
OR
- 21
- 22
Configuration 2
OR
- 11
- 11
- 11
- 42.1
- 13.2
- 12
- 12
- 10
- 11
- 11
- 11
- 12
- 12
- 12
- 2.1
- 2.1
- 5
- 12
Configuration 3
OR
- 6.0
- 7.0
- 6.0
- 7.0
- 7.1
- 6.0
- 7.0
- 6.7.z
- 7.1
- 6.0
- 7.0
Configuration 4
OR
- 7.0
- 8.0
Configuration 5
OR
- 12.04
- 14.04
- 15.04
- 15.10
No data.
Red Hat Enterprise Linux 6
ntp-0:4.2.6p5-5.el6_7.2
Fixed · RHSA-2015:1930
Red Hat Enterprise Linux 7
ntp-0:4.2.6p5-19.ael7b_1.3
Fixed · RHSA-2015:1930
Red Hat Enterprise Linux 5
ntp
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | ntp-0:4.2.6p5-5.el6_7.2 | Fixed | RHSA-2015:1930 |
| Red Hat Enterprise Linux 7 | ntp-0:4.2.6p5-19.ael7b_1.3 | Fixed | RHSA-2015:1930 |
| Red Hat Enterprise Linux 5 | ntp | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/
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.
9.13% 0.09130
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.09130
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 (23 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 9.13% (0.09130) | 95.17th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.96% (0.08960) | 94.57th | v5 (v2026.06.15) |
| Dec 28, 2025 | 36.84% (0.36837) | 96.99th | v4 (v2025.03.14) |
| Dec 27, 2025 | 31.17% (0.31173) | 96.62th | v4 (v2025.03.14) |
| Dec 15, 2025 | 36.84% (0.36837) | 96.98th | v4 (v2025.03.14) |
| Dec 13, 2025 | 39.33% (0.39328) | 97.13th | v4 (v2025.03.14) |
| Oct 28, 2025 | 34.23% (0.34229) | 96.77th | v4 (v2025.03.14) |
| Oct 27, 2025 | 31.17% (0.31173) | 96.55th | v4 (v2025.03.14) |
| Oct 1, 2025 | 34.23% (0.34229) | 96.86th | v4 (v2025.03.14) |
| Aug 10, 2025 | 31.17% (0.31173) | 96.58th | v4 (v2025.03.14) |
| Jun 26, 2025 | 17.79% (0.17786) | 94.79th | v4 (v2025.03.14) |
| Mar 30, 2025 | 20.00% (0.20005) | 95.00th | v4 (v2025.03.14) |
| Mar 29, 2025 | 30.64% (0.30639) | 94.82th | v4 (v2025.03.14) |
| Mar 17, 2025 | 20.00% (0.20005) | 95.01th | v4 (v2025.03.14) |
| Dec 17, 2024 | 36.12% (0.36124) | 97.17th | v3 (v2023.03.01) |
| Oct 21, 2024 | 5.94% (0.05936) | 93.63th | v3 (v2023.03.01) |
| Jun 23, 2024 | 4.24% (0.04242) | 92.33th | v3 (v2023.03.01) |
| May 11, 2024 | 2.94% (0.02944) | 90.79th | v3 (v2023.03.01) |
| Oct 25, 2023 | 2.06% (0.02057) | 87.76th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.66% (0.01663) | 85.64th | 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 (42)
- http://aix.software.ibm.com/aix/efixes/security/ntp_advisory5.asc x_refsource_CONFIRMThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170684.html vendor-advisoryx_refsource_FEDORAThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170926.html vendor-advisoryx_refsource_FEDORAThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.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-2015-1930.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://seclists.org/bugtraq/2016/Feb/164 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://support.ntp.org/bin/view/Main/NtpBug2956 x_refsource_CONFIRMIssue TrackingPatchVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p5_Securit x_refsource_CONFIRMIssue TrackingPatchVendor Advisory
- http://www.debian.org/security/2015/dsa-3388 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html x_refsource_CONFIRMThird Party Advisory
- http://www.securityfocus.com/bid/77312 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1034670 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-2783-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2015-5300 Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa113 x_refsource_CONFIRMThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1271076 x_refsource_CONFIRMIssue Tracking
- https://ics-cert.us-cert.gov/advisories/ICSA-15-356-01 x_refsource_MISCThird Party AdvisoryUS Government Resource
- https://nvd.nist.gov/vuln/detail/CVE-2015-5300
- https://security.netapp.com/advisory/ntap-20171004-0001/ x_refsource_CONFIRM
- https://support.citrix.com/article/CTX220112 x_refsource_CONFIRMThird Party Advisory
- https://www-01.ibm.com/support/docview.wss?uid=isg3T1023885 x_refsource_CONFIRMThird Party Advisory
- https://www-01.ibm.com/support/docview.wss?uid=isg3T1024073 x_refsource_CONFIRMThird Party Advisory
- https://www-01.ibm.com/support/docview.wss?uid=nas8N1021264 x_refsource_CONFIRMThird Party Advisory
- https://www-01.ibm.com/support/docview.wss?uid=ssg1S1005821 x_refsource_CONFIRMThird Party Advisory
- https://www-01.ibm.com/support/docview.wss?uid=swg21979393 x_refsource_CONFIRMThird Party Advisory
- https://www-01.ibm.com/support/docview.wss?uid=swg21980676 x_refsource_CONFIRMThird Party Advisory
- https://www-01.ibm.com/support/docview.wss?uid=swg21983501 x_refsource_CONFIRMThird Party Advisory
- https://www-01.ibm.com/support/docview.wss?uid=swg21983506 x_refsource_CONFIRMThird Party Advisory
- https://www.cs.bu.edu/~goldbe/NTPattack.html x_refsource_MISCThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2015-5300
- https://www.freebsd.org/security/advisories/FreeBSD-SA-16:02.ntp.asc vendor-advisoryx_refsource_FREEBSDThird Party Advisory
- https://www.ibm.com/support/home/docdisplay?lndocid=migr-5099428 x_refsource_CONFIRMThird Party Advisory
- https://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html x_refsource_CONFIRMThird Party Advisory
- https://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html x_refsource_CONFIRMThird Party Advisory
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Jul 21, 2017
Updated Aug 6, 2024
Reserved Jul 1, 2015
Link CVE-2015-5300
CISA Vulnrichment
Updated n/a