// For flags

CVE-2016-7426

ntp: Client rate limiting and server responses

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

NTP en versiones anteriores a 4.2.8p9 limita la clasificación de respuestas recibidas desde las fuentes configuradas cuando la limitación de clasificación para todas las asociaciones está habilitado, lo que permite a atacantes remotos provocar una denegación de servicio (prevenir las respuestas de las fuentes) enviando respuestas con una dirección de origen suplantada.

It was found that when ntp is configured with rate limiting for all associations the limits are also applied to responses received from its configured sources. A remote attacker who knows the sources can cause a denial of service by preventing ntpd from accepting valid responses from its sources.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2016-09-09 CVE Reserved
  • 2016-12-21 CVE Published
  • 2024-04-15 EPSS Updated
  • 2024-08-06 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
>= 4.2.6 < 4.2.8
Search vendor "Ntp" for product "Ntp" and version " >= 4.2.6 < 4.2.8"
-
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
>= 4.3.0 < 4.3.94
Search vendor "Ntp" for product "Ntp" and version " >= 4.3.0 < 4.3.94"
-
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p203
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p204
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p205
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p206
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p207
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p208
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p209
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p210
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p211
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p212
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p213
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p214
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p215
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p216
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p217
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p218
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p219
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p220
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p221
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p222
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p223
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p224
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p225
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p226
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p227
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p228
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p229
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p230
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p231_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p232_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p233_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p234_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p235_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p236_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p237_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p238_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p239_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p240_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p241_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p242_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p243_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p244_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p245_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p246_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p247_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p248_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p249_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.5
Search vendor "Ntp" for product "Ntp" and version "4.2.5"
p250_rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
-
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p1-beta1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p1-beta2
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p1-beta3
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p1-beta4
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p1-beta5
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p1-rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p1-rc2
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p2
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p2-rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p2-rc2
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p2-rc3
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p3
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p3-rc1
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p3-rc2
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p3-rc3
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p4
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p5
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p6
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p7
Affected
Ntp
Search vendor "Ntp"
Ntp
Search vendor "Ntp" for product "Ntp"
4.2.8
Search vendor "Ntp" for product "Ntp" and version "4.2.8"
p8
Affected
Canonical
Search vendor "Canonical"
Ubuntu Linux
Search vendor "Canonical" for product "Ubuntu Linux"
12.04
Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"
esm
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Desktop
Search vendor "Redhat" for product "Enterprise Linux Desktop"
6.0
Search vendor "Redhat" for product "Enterprise Linux Desktop" and version "6.0"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Desktop
Search vendor "Redhat" for product "Enterprise Linux Desktop"
7.0
Search vendor "Redhat" for product "Enterprise Linux Desktop" and version "7.0"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server
Search vendor "Redhat" for product "Enterprise Linux Server"
6.0
Search vendor "Redhat" for product "Enterprise Linux Server" and version "6.0"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server
Search vendor "Redhat" for product "Enterprise Linux Server"
7.0
Search vendor "Redhat" for product "Enterprise Linux Server" and version "7.0"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server Aus
Search vendor "Redhat" for product "Enterprise Linux Server Aus"
7.3
Search vendor "Redhat" for product "Enterprise Linux Server Aus" and version "7.3"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server Aus
Search vendor "Redhat" for product "Enterprise Linux Server Aus"
7.4
Search vendor "Redhat" for product "Enterprise Linux Server Aus" and version "7.4"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server Aus
Search vendor "Redhat" for product "Enterprise Linux Server Aus"
7.6
Search vendor "Redhat" for product "Enterprise Linux Server Aus" and version "7.6"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server Aus
Search vendor "Redhat" for product "Enterprise Linux Server Aus"
7.7
Search vendor "Redhat" for product "Enterprise Linux Server Aus" and version "7.7"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server Eus
Search vendor "Redhat" for product "Enterprise Linux Server Eus"
7.3
Search vendor "Redhat" for product "Enterprise Linux Server Eus" and version "7.3"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server Eus
Search vendor "Redhat" for product "Enterprise Linux Server Eus"
7.4
Search vendor "Redhat" for product "Enterprise Linux Server Eus" and version "7.4"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server Eus
Search vendor "Redhat" for product "Enterprise Linux Server Eus"
7.5
Search vendor "Redhat" for product "Enterprise Linux Server Eus" and version "7.5"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server Eus
Search vendor "Redhat" for product "Enterprise Linux Server Eus"
7.6
Search vendor "Redhat" for product "Enterprise Linux Server Eus" and version "7.6"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server Eus
Search vendor "Redhat" for product "Enterprise Linux Server Eus"
7.7
Search vendor "Redhat" for product "Enterprise Linux Server Eus" and version "7.7"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server Tus
Search vendor "Redhat" for product "Enterprise Linux Server Tus"
7.3
Search vendor "Redhat" for product "Enterprise Linux Server Tus" and version "7.3"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server Tus
Search vendor "Redhat" for product "Enterprise Linux Server Tus"
7.6
Search vendor "Redhat" for product "Enterprise Linux Server Tus" and version "7.6"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Server Tus
Search vendor "Redhat" for product "Enterprise Linux Server Tus"
7.7
Search vendor "Redhat" for product "Enterprise Linux Server Tus" and version "7.7"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Workstation
Search vendor "Redhat" for product "Enterprise Linux Workstation"
6.0
Search vendor "Redhat" for product "Enterprise Linux Workstation" and version "6.0"
-
Affected
Redhat
Search vendor "Redhat"
Enterprise Linux Workstation
Search vendor "Redhat" for product "Enterprise Linux Workstation"
7.0
Search vendor "Redhat" for product "Enterprise Linux Workstation" and version "7.0"
-
Affected
Hpe
Search vendor "Hpe"
Hpux-ntp
Search vendor "Hpe" for product "Hpux-ntp"
>= b.11.31 < c.4.2.8.2.0
Search vendor "Hpe" for product "Hpux-ntp" and version " >= b.11.31 < c.4.2.8.2.0"
-
Affected