CVE-2016-4954

HIGH
7.5
CVSS Score
Published: July 5, 2016 at 01:00 AM UTC
Updated: June 17, 2026 at 12:48 AM UTC
15 products affected across 5 vendorsLeapopenSUSESolaris

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Severity
HIGH7.5
Exploit prediction
EPSS 13%

Description

The process_packet function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (peer-variable modification) by sending spoofed packets from many source IP addresses in a certain scenario, as demonstrated by triggering an incorrect leap indication.

Affected

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

Affected range stops below 4.2.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.3.93, so it looks safe — our inference, not a vendor statement
All versions
siemens-simatic-net-cp-443-1-opc-ua (same device)
All versions
siemens-tim-4r-ie-dnp3 (same device)
All versions
siemens-tim-4r-ie (same device)

References (35)

x_refsource_CONFIRMIssue TrackingVendor Advisory
http://bugs.ntp.org/3044
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html

CVSS

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

Quick Info

StatusMODIFIED
CWE
CWE-362

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