CVE-2015-7871

ntp: crypto-NAK symmetric association authentication bypass vulnerability

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Severity

Important

Red Hat Product Security

6.4

CVSS 2.0

Review impact separately from score.

Published · October 21, 2015

Updated · May 13, 2026

Description

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.

Statement

This issue did not affect the versions of ntp as shipped with Red Hat Enterprise Linux 5, 6, and 7.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 2.0 · 6.4
AV:N/AC:L/Au:N/C:N/I:P/A:P

CWE-305 · Authentication Bypass by Primary Weakness