CVE-2015-7855: Debian Linux

Medium severity, CVSS 6.5. EPSS: 31.1% chance of exploitation in the next 30 days.

The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (assertion failure) via a 6 or mode 7 packet containing a long data value.

Affected products

• Debian Debian Linux: version 7.0 only; version 8.0 only; version 9.0 only
• Netapp Clustered Data Ontap: affected versions not specified
• Netapp Data Ontap: affected versions not specified
• Netapp Oncommand Balance: affected versions not specified
• Netapp Oncommand Performance Manager: affected versions not specified
• Netapp Oncommand Unified Manager: affected versions not specified
• Ntp Ntp: from 4.2.0, before 4.2.8 (fixed in 4.2.8); from 4.3.0, before 4.3.77 (fixed in 4.3.77); version 4.2.8 only
• Siemens Tim 4r-Ie DNP3 Firmware: any version
• Siemens Tim 4r-Ie Firmware: any version

Published 2017-08-07. Last modified 2026-06-17.