What’s Vulnerable › Vulnerabilities

CVE-2015-7850

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-08-07 · updated 2026-06-17
• Weakness: CWE-835

Description

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.

Affected products

• Debian Linux: 7.0, 8.0, 9.0
• Clustered Data ONTAP: all versions
• NetApp Data ONTAP operating in 7-Mode: all versions
• NetApp Oncommand Balance: all versions
• NetApp Oncommand Performance Manager: all versions
• NetApp OnCommand Unified Manager for 7-Mode (core package): all versions
• NTP: from 4.2.0 before 4.2.8; from 4.3.0 before 4.3.77; 4.2.8, 4.2.8-p1, 4.2.8-p1-beta1, 4.2.8-p1-beta2, 4.2.8-p1-beta3, 4.2.8-p1-beta4 (+11) — fixed in 4.2.8, 4.3.77

How to fix

Upgrade to a fixed version: NTP 4.2.8, 4.3.77. Check the vendor advisory for mitigations.

References

• http://support.ntp.org/bin/view/Main/NtpBug2917
• http://www.debian.org/security/2015/dsa-3388
• http://www.securityfocus.com/bid/77279
• http://www.securitytracker.com/id/1033951
• https://bugzilla.redhat.com/show_bug.cgi?id=1274258
• https://security.gentoo.org/glsa/201607-15
• https://security.netapp.com/advisory/ntap-20171004-0001/
• http://support.ntp.org/bin/view/Main/NtpBug2917
• http://www.debian.org/security/2015/dsa-3388
• http://www.securityfocus.com/bid/77279
• http://www.securitytracker.com/id/1033951
• https://bugzilla.redhat.com/show_bug.cgi?id=1274258

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