Directory traversal vulnerability in the save_config function in ntpd in ntp_control.c in NTP before 4.2.8p4, when used on systems that do not use '\' or '/' characters for directory separation such as OpenVMS, allows remote authenticated users to overwrite arbitrary files.
CVE-2015-7851
MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 31% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 4%CVSS: 6.5Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 6.5(medium)
- EPSS
- 89.2%
- KEV
- Not listed
Published
January 28, 2020
Last Modified
November 21, 2024
References (6)
- cve@mitrehttp://support.ntp.org/bin/view/Main/NtpBug2918
- cve@mitrehttp://support.ntp.org/bin/view/Main/SecurityNotice
- cve@mitrehttp://www.talosintel.com/reports/TALOS-2015-0062/
- af854a3a-2127-422b-91ae-364da2661108http://support.ntp.org/bin/view/Main/NtpBug2918
- af854a3a-2127-422b-91ae-364da2661108http://support.ntp.org/bin/view/Main/SecurityNotice
- af854a3a-2127-422b-91ae-364da2661108http://www.talosintel.com/reports/TALOS-2015-0062/
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2015-7851?
CVE-2015-7851 is a medium vulnerability published on January 28, 2020. Directory traversal vulnerability in the saveconfig function in ntpd in ntpcontrol.c in NTP before 4.2.8p4, when used on systems that do not use '\' or '/' characters for directory separation such as OpenVMS, allows remote authenticated users to overwrite arbitrary files.
When was CVE-2015-7851 disclosed?
CVE-2015-7851 was first published in the National Vulnerability Database on January 28, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-7851 actively exploited?
CVE-2015-7851 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 89.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2015-7851?
CVE-2015-7851 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2015-7851?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-7851, 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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