CVE-2015-7871

CRITICAL

9.8

CVSS Score

Published: August 7, 2017 at 08:00 PM UTC

Updated: June 17, 2026 at 12:33 AM UTC

7 products affected across 3 vendorsDebian LinuxClustered Data ONTAPOncommand Unified Manager

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Severity

CRITICAL9.8

Exploit prediction

EPSS 82%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux · Debiandrupal

95%

7.0 8.0 9.0

Clustered Data ONTAP · NetApp

95%

All versions

Data Ontap · NetApp

95%

All versions

Oncommand Balance · NetApp

95%

All versions

Oncommand Performance Manager · NetApp

95%

All versions

Oncommand Unified Manager · NetApp

95%

All versions

NTP · Ntp

95%

4.2.6 ≤ v < 4.2.84.3.0 ≤ v < 4.3.774.2.5 p186 4.2.5 p187 4.2.5 p188 4.2.5 p189 4.2.5 p190 4.2.5 p191 4.2.5 p192 4.2.5 p193 4.2.5 p194 4.2.5 p195 4.2.5 p196 4.2.5 p197 4.2.5 p198 4.2.5 p199 4.2.5 p200 4.2.5 p201 4.2.5 p202 4.2.5 p203 4.2.5 p204 4.2.5 p205 4.2.5 p206 4.2.5 p207 4.2.5 p208 4.2.5 p209 4.2.5 p210 4.2.5 p211 4.2.5 p212 4.2.5 p213 4.2.5 p214 4.2.5 p215 4.2.5 p216 4.2.5 p217 4.2.5 p218 4.2.5 p219 4.2.5 p220 4.2.5 p221 4.2.5 p222 4.2.5 p223 4.2.5 p224 4.2.5 p225 4.2.5 p226 4.2.5 p227 4.2.5 p228 4.2.5 p229 4.2.5 p230 4.2.5 p231_rc1 4.2.5 p232_rc1 4.2.5 p233_rc1 4.2.5 p234_rc1 4.2.5 p235_rc1 4.2.5 p236_rc1 4.2.5 p237_rc1 4.2.5 p238_rc1 4.2.5 p239_rc1 4.2.5 p240_rc1 4.2.5 p241_rc1 4.2.5 p242_rc1 4.2.5 p243_rc1 4.2.5 p244_rc1 4.2.5 p245_rc1 4.2.5 p246_rc1 4.2.5 p247_rc1 4.2.5 p248_rc1 4.2.5 p249_rc1 4.2.5 p250_rc1 4.2.8 p1 4.2.8 p1-beta1 4.2.8 p1-beta2 4.2.8 p1-beta3 4.2.8 p1-beta4 4.2.8 p1-beta5 4.2.8 p1-rc1 4.2.8 p1-rc2 4.2.8 p2 4.2.8 p2-rc1 4.2.8 p2-rc2 4.2.8 p2-rc3 4.2.8 p3 4.2.8 p3-rc1 4.2.8 p3-rc2 4.2.8 p3-rc3

Affected range stops below 4.2.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.3.77, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (10)

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

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

Vendor Advisoryx_refsource_DEBIANThird Party Advisory

Source: [email protected]

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

VDB Entryx_refsource_BIDThird Party Advisory

Source: [email protected]

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

VDB Entryx_refsource_SECTRACKThird Party Advisory

Source: [email protected]

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

x_refsource_CONFIRMIssue TrackingThird Party AdvisoryVDB Entry

Source: [email protected]

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

x_refsource_CONFIRM

Source: [email protected]

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

x_refsource_CONFIRMThird Party AdvisoryVDB Entry

Source: [email protected]

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

Vendor Advisoryx_refsource_GENTOOThird Party AdvisoryVDB Entry

Source: [email protected]

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

CVSS

9.8CRITICAL[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-287

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