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Vulnerability record · CVE-2015-7853 · published 7 August 2017

CVE-2015-7853: Ntp classic buffer overflow vulnerability

Ntp · Ntp

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 attackers to execute arbitrary code or cause a denial of service (crash) via a negative input value.

9.8 CVSS 3.1 Critical EPSS 12% · top 4.1% CWE-120 · Classic buffer overflow
9.8CVSS 3.1 base score, v2 7.5
12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
56References
17 Jun 2026Last modified by NVD

Description

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 attackers to execute arbitrary code or cause a denial of service (crash) via a negative input value.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.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/2015-11/msg00093.html
http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
http://packetstormsecurity.com/files/134082/FreeBSD-Security-Advisory-ntp-Authentication-Bypass.html
http://packetstormsecurity.com/files/134137/Slackware-Security-Advisory-ntp-Updates.html
http://support.ntp.org/bin/view/Main/NtpBug2920 PatchVendor Advisory
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151021-ntp
http://www.securityfocus.com/archive/1/536737/100/0/threaded
http://www.securityfocus.com/archive/1/536760/100/0/threaded
http://www.securityfocus.com/archive/1/536796/100/0/threaded
http://www.securityfocus.com/archive/1/536833/100/0/threaded
http://www.securityfocus.com/archive/1/archive/1/536737/100/100/threaded
http://www.securityfocus.com/archive/1/archive/1/536760/100/100/threaded
http://www.securityfocus.com/archive/1/archive/1/536796/100/100/threaded
http://www.securityfocus.com/archive/1/archive/1/536833/100/100/threaded
http://www.securityfocus.com/bid/77273 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1033951 Third Party AdvisoryVDB Entry
http://www.talosintel.com/vulnerability-reports/
http://www.ubuntu.com/usn/USN-2783-1
https://bto.bluecoat.com/security-advisory/sa103
https://bugzilla.redhat.com/show_bug.cgi?id=1274262 Issue TrackingThird Party AdvisoryVDB Entry
https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
https://security.gentoo.org/glsa/201607-15 Third Party AdvisoryVDB Entry
https://security.netapp.com/advisory/ntap-20171004-0001/ Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.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/2015-11/msg00093.html
http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
http://packetstormsecurity.com/files/134082/FreeBSD-Security-Advisory-ntp-Authentication-Bypass.html
http://packetstormsecurity.com/files/134137/Slackware-Security-Advisory-ntp-Updates.html
http://support.ntp.org/bin/view/Main/NtpBug2920 PatchVendor Advisory
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151021-ntp
http://www.securityfocus.com/archive/1/536737/100/0/threaded
http://www.securityfocus.com/archive/1/536760/100/0/threaded

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Source: NIST National Vulnerability Database (record CVE-2015-7853), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.