CVE-2015-7871

critical

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.

References

Advisories
More

https://security.netapp.com/advisory/ntap-20171004-0001/

https://security.gentoo.org/glsa/201607-15

https://security.gentoo.org/glsa/201604-03

https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839

https://bugzilla.redhat.com/show_bug.cgi?id=1274265

http://www.securitytracker.com/id/1033951

http://www.securityfocus.com/bid/77287

http://www.debian.org/security/2015/dsa-3388

https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf

http://support.ntp.org/bin/view/Main/NtpBug2941

Details

Source: Mitre, NVD

Published: 2017-08-07

Updated: 2025-04-20

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.84001