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  • Results Type: Overview
  • Keyword (text search): cpe:2.3:a:ntp:ntp:4.2.8:p4:*:*:*:*:*:*
There are 18 matching records.
Displaying matches 1 through 18.
Vuln ID Summary CVSS Severity
CVE-2020-13817

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (daemon exit or system time change) by predicting transmit timestamps for use in spoofed packets. The victim must be relying on unauthenticated IPv4 time sources. There must be an off-path attacker who can query time from the victim's ntpd instance.

Published: June 04, 2020; 9:15:11 AM -0400
V3.1: 7.4 HIGH
V2.0: 5.8 MEDIUM
CVE-2020-11868

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated synchronization via a server mode packet with a spoofed source IP address, because transmissions are rescheduled even when a packet lacks a valid origin timestamp.

Published: April 17, 2020; 12:15:10 AM -0400
V3.1: 7.5 HIGH
V2.0: 5.0 MEDIUM
CVE-2019-8936

NTP through 4.2.8p12 has a NULL Pointer Dereference.

Published: May 15, 2019; 12:29:01 PM -0400
V3.1: 7.5 HIGH
V2.0: 5.0 MEDIUM
CVE-2018-7185

The protocol engine in ntp 4.2.6 before 4.2.8p11 allows a remote attackers to cause a denial of service (disruption) by continually sending a packet with a zero-origin timestamp and source IP address of the "other side" of an interleaved association causing the victim ntpd to reset its association.

Published: March 06, 2018; 3:29:01 PM -0500
V3.1: 7.5 HIGH
V2.0: 5.0 MEDIUM
CVE-2018-7184

ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a denial of service (disruption) by sending a packet with a zero-origin timestamp causing the association to reset and setting the contents of the packet as the most recent timestamp. This issue is a result of an incomplete fix for CVE-2015-7704.

Published: March 06, 2018; 3:29:01 PM -0500
V3.0: 7.5 HIGH
V2.0: 5.0 MEDIUM
CVE-2018-7170

ntpd in ntp 4.2.x before 4.2.8p7 and 4.3.x before 4.3.92 allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of ntpd and modify a victim's clock via a Sybil attack. This issue exists because of an incomplete fix for CVE-2016-1549.

Published: March 06, 2018; 3:29:01 PM -0500
V3.1: 5.3 MEDIUM
V2.0: 3.5 LOW
CVE-2015-5300

The panic_gate check in NTP before 4.2.8p5 is only re-enabled after the first change to the system clock that was greater than 128 milliseconds by default, which allows remote attackers to set NTP to an arbitrary time when started with the -g option, or to alter the time by up to 900 seconds otherwise by responding to an unspecified number of requests from trusted sources, and leveraging a resulting denial of service (abort and restart).

Published: July 21, 2017; 10:29:00 AM -0400
V3.0: 7.5 HIGH
V2.0: 5.0 MEDIUM
CVE-2016-7434

The read_mru_list function in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (crash) via a crafted mrulist query.

Published: January 13, 2017; 11:59:00 AM -0500
V3.1: 7.5 HIGH
V2.0: 4.3 MEDIUM
CVE-2016-7426

NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.

Published: January 13, 2017; 11:59:00 AM -0500
V3.1: 7.5 HIGH
V2.0: 4.3 MEDIUM
CVE-2016-1550

An exploitable vulnerability exists in the message authentication functionality of libntp in ntp 4.2.8p4 and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92. An attacker can send a series of crafted messages to attempt to recover the message digest key.

Published: January 06, 2017; 4:59:00 PM -0500
V3.0: 5.3 MEDIUM
V2.0: 5.0 MEDIUM
CVE-2016-1549

A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.

Published: January 06, 2017; 4:59:00 PM -0500
V3.0: 6.5 MEDIUM
V2.0: 4.0 MEDIUM
CVE-2016-1548

An attacker can spoof a packet from a legitimate ntpd server with an origin timestamp that matches the peer->dst timestamp recorded for that server. After making this switch, the client in NTP 4.2.8p4 and earlier and NTPSec aa48d001683e5b791a743ec9c575aaf7d867a2b0c will reject all future legitimate server responses. It is possible to force the victim client to move time after the mode has been changed. ntpq gives no indication that the mode has been switched.

Published: January 06, 2017; 4:59:00 PM -0500
V3.0: 7.2 HIGH
V2.0: 6.4 MEDIUM
CVE-2016-1547

An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled.

Published: January 06, 2017; 4:59:00 PM -0500
V3.0: 5.3 MEDIUM
V2.0: 5.0 MEDIUM
CVE-2016-4956

ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (interleaved-mode transition and time change) via a spoofed broadcast packet. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-1548.

Published: July 04, 2016; 9:59:03 PM -0400
V3.1: 5.3 MEDIUM
V2.0: 5.0 MEDIUM
CVE-2016-4955

ntpd in NTP 4.x before 4.2.8p8, when autokey is enabled, allows remote attackers to cause a denial of service (peer-variable clearing and association outage) by sending (1) a spoofed crypto-NAK packet or (2) a packet with an incorrect MAC value at a certain time.

Published: July 04, 2016; 9:59:02 PM -0400
V3.1: 5.9 MEDIUM
V2.0: 4.3 MEDIUM
CVE-2016-4954

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.

Published: July 04, 2016; 9:59:01 PM -0400
V3.1: 7.5 HIGH
V2.0: 5.0 MEDIUM
CVE-2016-4953

ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (ephemeral-association demobilization) by sending a spoofed crypto-NAK packet with incorrect authentication data at a certain time.

Published: July 04, 2016; 9:59:00 PM -0400
V3.1: 7.5 HIGH
V2.0: 5.0 MEDIUM
CVE-2015-7974

NTP 4.x before 4.2.8p6 and 4.3.x before 4.3.90 do not verify peer associations of symmetric keys when authenticating packets, which might allow remote attackers to conduct impersonation attacks via an arbitrary trusted key, aka a "skeleton key."

Published: January 26, 2016; 2:59:00 PM -0500
V3.1: 7.7 HIGH
V2.0: 4.0 MEDIUM