CVE-2015-7975

CVE-2015-7975 is a medium-severity vulnerability in Ntp with a CVSS 3.x base score of 6.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

• Severity: Medium (CVSS 3.x base score 6.2)
• CVSS v2: 2.1
• EPSS exploit prediction: 1% (46th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-119
• Affected product: Ntp
• Published: 2017-01-30
• Last modified: 2026-06-17

Description

The nextvar function in NTP before 4.2.8p6 and 4.3.x before 4.3.90 does not properly validate the length of its input, which allows an attacker to cause a denial of service (application crash).

Frequently asked questions

What is CVE-2015-7975?

The nextvar function in NTP before 4.2.8p6 and 4.3.x before 4.3.90 does not properly validate the length of its input, which allows an attacker to cause a denial of service (application crash).

How severe is CVE-2015-7975?

CVE-2015-7975 has a CVSS 3.x base score of 6.2, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2015-7975 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-7975?

CVE-2015-7975 primarily affects Ntp. In total, 90 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-7975?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-7975 published?

CVE-2015-7975 was published on 2017-01-30 and last updated on 2026-06-17.

References

• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.html
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.html
• http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html
• http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html
• http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html
• http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
• http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
• http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
• http://support.ntp.org/bin/view/Main/NtpBug2937
• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160127-ntpd
• http://www.securityfocus.com/bid/81959
• http://www.securitytracker.com/id/1034782
• http://www.ubuntu.com/usn/USN-3096-1
• https://bto.bluecoat.com/security-advisory/sa113
• https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03750en_us
• https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03766en_us
• https://security.FreeBSD.org/advisories/FreeBSD-SA-16:09.ntp.asc
• https://security.gentoo.org/glsa/201607-15
• https://security.netapp.com/advisory/ntap-20171031-0001/
• https://www.kb.cert.org/vuls/id/718152

Affected products (90)

• cpe:2.3:a:ntp:ntp:*:p5:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.1:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.2:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.3:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.4:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.5:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.6:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.7:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.8:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.10:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.11:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.12:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.13:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.14:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.15:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.16:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.17:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.18:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.19:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.20:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.21:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.22:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.23:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.24:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.25:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.26:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.27:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.28:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.29:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.30:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.31:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.32:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.33:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.34:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.35:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.36:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.37:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.38:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.39:*:*:*:*:*:*:*

More vulnerabilities in Ntp

• CVE-2018-12327 — Critical (CVSS 9.8): Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker to achieve code execution or…
• CVE-2018-7183 — Critical (CVSS 9.8): Buffer overflow in the decodearr function in ntpq in ntp 4.2.8p6 through 4.2.8p10 allows remote attackers to execute…
• CVE-2015-7871 — Critical (CVSS 9.8): Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass…
• CVE-2015-7853 — Critical (CVSS 9.8): The datalen parameter in the refclock driver in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote…
• CVE-2015-7705 — Critical (CVSS 9.8): The rate limiting feature in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to have unspecified…
• CVE-2015-7854 — High (CVSS 8.8): Buffer overflow in the password management functionality in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows…

All CVEs affecting Ntp →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

• CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
• CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…
• CVE-2025-1866 — Critical (CVSS 10.0): Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows…
• CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
• CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
• CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 197.248.207.139 (ipv4-addr)
• 135.129.128.247 (ipv4-addr)
• 119.201.59.224 (ipv4-addr)
• 125.212.244.35 (ipv4-addr)
• 202.29.220.126 (ipv4-addr)
• 93.42.227.251 (ipv4-addr)
• 82.209.191.11 (ipv4-addr)
• 119.204.60.250 (ipv4-addr)