What is CVE-2015-7871?

CVE-2015-7871 is a critical-severity vulnerability in NetApp Clustered Data Ontap, classified under Improper Authentication. CVSS score: 9.8/10. Published 2017-08-07.

How severe is CVE-2015-7871?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2015-7871 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in NetApp Clustered Data Ontap

CVE-2015-7871

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.

Vulnerability class: Broken Authentication

Published 2017-08-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.818 (99.6th percentile), scored 2026-10-18.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.818 · newest: 0.818 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-287 — Improper Authentication

Public proof-of-concept exploits

References

support.ntp.org/bin/view/Main/NtpBug2941 (Vendor Advisory)
bugzilla.redhat.com/show_bug.cgi (VDB Entry, Third Party Advisory, Issue Tracking)
www.securitytracker.com/id/1033951 (VDB Entry, Third Party Advisory, vdb-entry)
www.debian.org/security/2015/dsa-3388 (vendor-advisory, Third Party Advisory)
www.securityfocus.com/bid/77287 (VDB Entry, Third Party Advisory, vdb-entry)
security.gentoo.org/glsa/201604-03 (vendor-advisory, VDB Entry, Third Party Advisory)
h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay (VDB Entry, Third Party Advisory)
security.gentoo.org/glsa/201607-15 (vendor-advisory, VDB Entry, Third Party Advisory)
security.netapp.com/advisory/ntap-20171004-0001/ (Third Party Advisory)
cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf

Frequently asked questions

What is CVE-2015-7871?: CVE-2015-7871 is a critical-severity vulnerability in NetApp Clustered Data Ontap, classified under Improper Authentication. CVSS score: 9.8/10. Published 2017-08-07.
How severe is CVE-2015-7871?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2015-7871 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.