ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to cause a denial of service (infinite loop or crash) by pointing the key file at the log file.
CVE-2015-7850
MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence
Score 6.5 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 6.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 5%CVSS: 6.5Exploit: NoneExposed: 0
A fix is available — apply it.
- CVSS v3
- 6.5
- EG Score
- 6.5(medium)
- EPSS
- 91.2%
- KEV
- Not listed
Published
August 7, 2017
Last Modified
May 13, 2026
References (14)
- cve@mitrehttp://support.ntp.org/bin/view/Main/NtpBug2917
- cve@mitrehttp://www.debian.org/security/2015/dsa-3388
- cve@mitrehttp://www.securityfocus.com/bid/77279
- cve@mitrehttp://www.securitytracker.com/id/1033951
- cve@mitrehttps://bugzilla.redhat.com/show_bug.cgi?id=1274258
- cve@mitrehttps://security.gentoo.org/glsa/201607-15
- cve@mitrehttps://security.netapp.com/advisory/ntap-20171004-0001/
- af854a3a-2127-422b-91ae-364da2661108http://support.ntp.org/bin/view/Main/NtpBug2917
- af854a3a-2127-422b-91ae-364da2661108http://www.debian.org/security/2015/dsa-3388
- af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/77279
- af854a3a-2127-422b-91ae-364da2661108http://www.securitytracker.com/id/1033951
- af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1274258
- af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/201607-15
- af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20171004-0001/
Frequently asked(5)
What is CVE-2015-7850?
CVE-2015-7850 is a medium vulnerability published on August 7, 2017. ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to cause a denial of service (infinite loop or crash) by pointing the key file at the log file.
When was CVE-2015-7850 disclosed?
CVE-2015-7850 was first published in the National Vulnerability Database on August 7, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-7850 actively exploited?
CVE-2015-7850 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2015-7850?
CVE-2015-7850 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2015-7850?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-7850, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
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