HOME VULNERABILITIESCVE-2015-5300

HIGH

CVE-2015-5300

CWE-361Published: July 21, 2017· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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).

Technical Analysis

CVE-2015-5300 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Affected Vendors & Products

Canonical1 product(s)

ubuntu linux

Debian1 product(s)

debian linux

Fedora1 product(s)

fedora

ntp1 product(s)

ntp

openSUSE2 product(s)

leapopensuse

Red Hat6 product(s)

enterprise linux desktopenterprise linux hpc nodeenterprise linux hpc node eusenterprise linux serverenterprise linux server eusenterprise linux workstation

SUSE8 product(s)

linux enterprise debuginfolinux enterprise desktoplinux enterprise serverlinux enterprise software development kitmanagermanager proxyopenstack cloudsuse linux enterprise server

Source: NVD CPE · 32 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://support.ntp.org/bin/view/Main/NtpBug2956

PATCHhttp://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p5_Securit

PATCHhttp://support.ntp.org/bin/view/Main/NtpBug2956

PATCHhttp://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p5_Securit

ADVISORYhttp://aix.software.ibm.com/aix/efixes/security/ntp_advisory5.asc

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2015-November/170684.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2015-November/170926.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html

ADVISORYhttp://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2015-1930.html

ADVISORYhttp://seclists.org/bugtraq/2016/Feb/164

ADVISORYhttp://www.debian.org/security/2015/dsa-3388

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html

ADVISORYhttp://www.securityfocus.com/bid/77312

ADVISORYhttp://www.securitytracker.com/id/1034670

ADVISORYhttp://www.ubuntu.com/usn/USN-2783-1

ADVISORYhttps://bto.bluecoat.com/security-advisory/sa113

ADVISORYhttps://ics-cert.us-cert.gov/advisories/ICSA-15-356-01

ADVISORYhttps://support.citrix.com/article/CTX220112

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=isg3T1023885

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=isg3T1024073

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=nas8N1021264

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=ssg1S1005821

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=swg21979393

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=swg21980676

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=swg21983501

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=swg21983506

ADVISORYhttps://www.cs.bu.edu/~goldbe/NTPattack.html

ADVISORYhttps://www.freebsd.org/security/advisories/FreeBSD-SA-16:02.ntp.asc

ADVISORYhttps://www.ibm.com/support/home/docdisplay?lndocid=migr-5099428

ADVISORYhttps://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html

ADVISORYhttps://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html

ADVISORYhttp://aix.software.ibm.com/aix/efixes/security/ntp_advisory5.asc

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2015-November/170684.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2015-November/170926.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html

ADVISORYhttp://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2015-1930.html

ADVISORYhttp://seclists.org/bugtraq/2016/Feb/164

ADVISORYhttp://www.debian.org/security/2015/dsa-3388

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html

ADVISORYhttp://www.securityfocus.com/bid/77312

ADVISORYhttp://www.securitytracker.com/id/1034670

ADVISORYhttp://www.ubuntu.com/usn/USN-2783-1

ADVISORYhttps://bto.bluecoat.com/security-advisory/sa113

ADVISORYhttps://ics-cert.us-cert.gov/advisories/ICSA-15-356-01

ADVISORYhttps://support.citrix.com/article/CTX220112

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=isg3T1023885

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=isg3T1024073

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=nas8N1021264

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=ssg1S1005821

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=swg21979393

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=swg21980676

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=swg21983501

ADVISORYhttps://www-01.ibm.com/support/docview.wss?uid=swg21983506

ADVISORYhttps://www.cs.bu.edu/~goldbe/NTPattack.html

ADVISORYhttps://www.freebsd.org/security/advisories/FreeBSD-SA-16:02.ntp.asc

ADVISORYhttps://www.ibm.com/support/home/docdisplay?lndocid=migr-5099428

ADVISORYhttps://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html

ADVISORYhttps://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html

All References (78)

→

http://aix.software.ibm.com/aix/efixes/security/ntp_advisory5.ascThird Party Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170684.htmlThird Party Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170926.htmlThird Party Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.htmlThird Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.htmlThird Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.htmlThird Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.htmlThird Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.htmlThird Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.htmlThird Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.htmlThird Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.htmlThird Party Advisory

→

http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2015-1930.htmlThird Party Advisory

→

http://seclists.org/bugtraq/2016/Feb/164Mailing List · Third Party Advisory

→

http://support.ntp.org/bin/view/Main/NtpBug2956Issue Tracking · Patch · Vendor Advisory

Quick Facts

CVE IDCVE-2015-5300

CVSS Score7.5 / 10

SeverityHIGH

WeaknessCWE-361

CISA KEVNo

Affected7 vendor(s)

PublishedJul 21, 2017

Related CVEs (CWE-361)

CVE-2016-1000341

CVE-2016-1000345

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2015-5300 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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