HOME VULNERABILITIESCVE-2015-7977

MEDIUM

CVE-2015-7977

CWE-476Published: January 30, 2017· Updated: Jun 17, 2026

5.9

CVSS v3.1

Official Description

ntpd in NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to cause a denial of service (NULL pointer dereference) via a ntpdc reslist command.

Technical Analysis

CVE-2015-7977 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 5.9.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/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

freebsd1 product(s)

freebsd

netapp2 product(s)

clustered data ontaponcommand balance

ntp1 product(s)

ntp

Oracle1 product(s)

linux

siemens4 product(s)

tim 4r-ie firmwaretim 4r-ietim 4r-ie dnp3 firmwaretim 4r-ie dnp3

Source: NVD CPE · 19 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

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

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2016-January/176434.html

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

ADVISORYhttp://support.ntp.org/bin/view/Main/NtpBug2939

ADVISORYhttp://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_NTP_4_2_8p7_Security

ADVISORYhttp://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160127-ntpd

ADVISORYhttp://www.debian.org/security/2016/dsa-3629

ADVISORYhttp://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html

ADVISORYhttp://www.securityfocus.com/bid/81815

ADVISORYhttp://www.securitytracker.com/id/1034782

ADVISORYhttp://www.ubuntu.com/usn/USN-3096-1

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

ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf

ADVISORYhttps://security.FreeBSD.org/advisories/FreeBSD-SA-16:09.ntp.asc

ADVISORYhttps://security.gentoo.org/glsa/201607-15

ADVISORYhttps://security.netapp.com/advisory/ntap-20171031-0001/

ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-103-11

ADVISORYhttps://www.kb.cert.org/vuls/id/718152

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

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2016-January/176434.html

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

ADVISORYhttp://support.ntp.org/bin/view/Main/NtpBug2939

ADVISORYhttp://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_NTP_4_2_8p7_Security

ADVISORYhttp://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160127-ntpd

ADVISORYhttp://www.debian.org/security/2016/dsa-3629

ADVISORYhttp://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html

ADVISORYhttp://www.securityfocus.com/bid/81815

ADVISORYhttp://www.securitytracker.com/id/1034782

ADVISORYhttp://www.ubuntu.com/usn/USN-3096-1

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

ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf

ADVISORYhttps://security.FreeBSD.org/advisories/FreeBSD-SA-16:09.ntp.asc

ADVISORYhttps://security.gentoo.org/glsa/201607-15

ADVISORYhttps://security.netapp.com/advisory/ntap-20171031-0001/

ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-103-11

ADVISORYhttps://www.kb.cert.org/vuls/id/718152

All References (54)

→

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

→

http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176434.htmlThird Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.htmlBroken Link

→

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.htmlBroken Link

→

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.htmlBroken Link

→

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.htmlBroken Link

→

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.htmlBroken Link

→

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

→

http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.htmlBroken Link

→

http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.htmlBroken Link

→

http://rhn.redhat.com/errata/RHSA-2016-0780.htmlBroken Link

→

http://rhn.redhat.com/errata/RHSA-2016-2583.htmlBroken Link

→

http://support.ntp.org/bin/view/Main/NtpBug2939Vendor Advisory

→

http://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_NTP_4_2_8p7_SecurityVendor Advisory

→

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160127-ntpdThird Party Advisory

Quick Facts

CVE IDCVE-2015-7977

CVSS Score5.9 / 10

SeverityMEDIUM

WeaknessCWE-476

CISA KEVNo

Affected8 vendor(s)

PublishedJan 30, 2017

Related CVEs (CWE-476)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2015-7977 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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