medium
5.9
CWE
476
Advisory Published
Updated

CVE-2015-7977: Null Pointer Dereference

First published: Mon Jan 30 2017(Updated: )

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.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
debian/ntp
1:4.2.8p12+dfsg-4
1:4.2.8p15+dfsg-1
Siemens TIM 4R-IE
Siemens TIM 4R-IE DNP3
NTP<=4.2.8
NTP>=4.3.0<4.3.90
NTP=4.2.8
NTP=4.2.8-p1
NTP=4.2.8-p1-beta1
NTP=4.2.8-p1-beta2
NTP=4.2.8-p1-beta3
NTP=4.2.8-p1-beta4
NTP=4.2.8-p1-beta5
NTP=4.2.8-p1-rc1
NTP=4.2.8-p1-rc2
NTP=4.2.8-p2
NTP=4.2.8-p2-rc1
NTP=4.2.8-p2-rc2
NTP=4.2.8-p2-rc3
NTP=4.2.8-p3
NTP=4.2.8-p3-rc1
NTP=4.2.8-p3-rc2
NTP=4.2.8-p3-rc3
NTP=4.2.8-p4
NTP=4.2.8-p5
Oracle Linux=6
Siemens TIM 4R-IE DNP3
siemens SIMATIC TIM 4R-IE
Siemens TIM 4R-IE
Siemens TIM 4R-IE
IBM Data ONTAP
NetApp OnCommand Balance
FreeBSD Kernel=9.3
FreeBSD Kernel=9.3-p1
FreeBSD Kernel=9.3-p10
FreeBSD Kernel=9.3-p12
FreeBSD Kernel=9.3-p13
FreeBSD Kernel=9.3-p16
FreeBSD Kernel=9.3-p19
FreeBSD Kernel=9.3-p2
FreeBSD Kernel=9.3-p20
FreeBSD Kernel=9.3-p21
FreeBSD Kernel=9.3-p22
FreeBSD Kernel=9.3-p23
FreeBSD Kernel=9.3-p24
FreeBSD Kernel=9.3-p25
FreeBSD Kernel=9.3-p28
FreeBSD Kernel=9.3-p3
FreeBSD Kernel=9.3-p30
FreeBSD Kernel=9.3-p31
FreeBSD Kernel=9.3-p32
FreeBSD Kernel=9.3-p33
FreeBSD Kernel=9.3-p34
FreeBSD Kernel=9.3-p5
FreeBSD Kernel=9.3-p6
FreeBSD Kernel=9.3-p7
FreeBSD Kernel=9.3-p8
FreeBSD Kernel=9.3-p9
FreeBSD Kernel=10.1
FreeBSD Kernel=10.1-p1
FreeBSD Kernel=10.1-p10
FreeBSD Kernel=10.1-p12
FreeBSD Kernel=10.1-p15
FreeBSD Kernel=10.1-p16
FreeBSD Kernel=10.1-p17
FreeBSD Kernel=10.1-p18
FreeBSD Kernel=10.1-p19
FreeBSD Kernel=10.1-p2
FreeBSD Kernel=10.1-p22
FreeBSD Kernel=10.1-p24
FreeBSD Kernel=10.1-p25
FreeBSD Kernel=10.1-p26
FreeBSD Kernel=10.1-p27
FreeBSD Kernel=10.1-p3
FreeBSD Kernel=10.1-p4
FreeBSD Kernel=10.1-p5
FreeBSD Kernel=10.1-p6
FreeBSD Kernel=10.1-p7
FreeBSD Kernel=10.1-p8
FreeBSD Kernel=10.1-p9
FreeBSD Kernel=10.2
FreeBSD Kernel=10.2-p1
FreeBSD Kernel=10.2-p10
FreeBSD Kernel=10.2-p2
FreeBSD Kernel=10.2-p5
FreeBSD Kernel=10.2-p7
FreeBSD Kernel=10.2-p8
FreeBSD Kernel=10.2-p9
Red Hat Fedora=22
Red Hat Fedora=23
Debian Linux=8.0
Debian Linux=9.0
Ubuntu=12.04
Ubuntu=14.04
Ubuntu=16.04
All of
Siemens TIM 4R-IE DNP3
siemens SIMATIC TIM 4R-IE
All of
Siemens TIM 4R-IE
Siemens TIM 4R-IE

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2015-7977?

    CVE-2015-7977 has been classified as a moderate severity vulnerability that allows for denial of service via a NULL pointer dereference.

  • How do I fix CVE-2015-7977?

    To resolve CVE-2015-7977, update NTP to versions 4.2.8p12 or higher, or 4.3.90 or higher.

  • What software is affected by CVE-2015-7977?

    CVE-2015-7977 affects NTP versions before 4.2.8p6, and 4.3.x before 4.3.90, among others.

  • What type of vulnerability is CVE-2015-7977?

    CVE-2015-7977 is a denial-of-service vulnerability caused by a NULL pointer dereference.

  • Can CVE-2015-7977 be exploited remotely?

    Yes, CVE-2015-7977 can be exploited remotely using the ntpdc reslist command.

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