CVE-2015-7871: Debian Linux

Critical severity, CVSS 9.8. EPSS: 81.8% chance of exploitation in the next 30 days.

Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass authentication.

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 4.2.6, before 4.2.8 (fixed in 4.2.8); from 4.3.0, before 4.3.77 (fixed in 4.3.77); version 4.2.5 only; version 4.2.8 only

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