VULNERABILITY INTELLIGENCE
CVE-2015-1798
CVSS score1.8 LOW
EPSS probability2.24%
CISA KEVNot currently listed
Published2015-04-08
Last modified2026-06-17
CVSS vectorAV:A/AC:H/Au:N/C:N/I:P/A:N
Description
The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC.