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Vulnerability record · CVE-2015-5300 · published 21 July 2017

CVE-2015-5300: Fedoraproject fedora vulnerability

Fedoraproject · Fedora

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).

7.5 CVSS 3.0 High EPSS 9.1% · top 4.9% CWE-361 · CWE-361
7.5CVSS 3.0 base score, v2 5.0
9.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
20Affected product versions listed by NVD
78References
17 Jun 2026Last modified by NVD

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).

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

20 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://aix.software.ibm.com/aix/efixes/security/ntp_advisory5.asc Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170684.html Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170926.html Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2015-1930.html Third Party Advisory
http://seclists.org/bugtraq/2016/Feb/164 Mailing ListThird Party Advisory
http://support.ntp.org/bin/view/Main/NtpBug2956 Issue TrackingPatchVendor Advisory
http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p5_Securit Issue TrackingPatchVendor Advisory
http://www.debian.org/security/2015/dsa-3388 Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html Third Party Advisory
http://www.securityfocus.com/bid/77312 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1034670 Third Party AdvisoryVDB Entry
http://www.ubuntu.com/usn/USN-2783-1 Third Party Advisory
https://bto.bluecoat.com/security-advisory/sa113 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1271076 Issue Tracking
https://ics-cert.us-cert.gov/advisories/ICSA-15-356-01 Third Party AdvisoryUS Government Resource
https://security.netapp.com/advisory/ntap-20171004-0001/
https://support.citrix.com/article/CTX220112 Third Party Advisory
https://www-01.ibm.com/support/docview.wss?uid=isg3T1023885 Third Party Advisory
https://www-01.ibm.com/support/docview.wss?uid=isg3T1024073 Third Party Advisory
https://www-01.ibm.com/support/docview.wss?uid=nas8N1021264 Third Party Advisory
https://www-01.ibm.com/support/docview.wss?uid=ssg1S1005821 Third Party Advisory
https://www-01.ibm.com/support/docview.wss?uid=swg21979393 Third Party Advisory
https://www-01.ibm.com/support/docview.wss?uid=swg21980676 Third Party Advisory
https://www-01.ibm.com/support/docview.wss?uid=swg21983501 Third Party Advisory
https://www-01.ibm.com/support/docview.wss?uid=swg21983506 Third Party Advisory
https://www.cs.bu.edu/~goldbe/NTPattack.html Third Party Advisory
https://www.freebsd.org/security/advisories/FreeBSD-SA-16:02.ntp.asc Third Party Advisory
https://www.ibm.com/support/home/docdisplay?lndocid=migr-5099428 Third Party Advisory
https://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html Third Party Advisory
https://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html Third Party Advisory
http://aix.software.ibm.com/aix/efixes/security/ntp_advisory5.asc Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2015-5300), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.