Home/CVE/ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated synchronizatio
CVE

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 synchronizatio

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.

HIGH · CVSS 7.5 EPSS 0.01497
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-346Origin Validation Error
CWE-346Origin Validation Error
▤

Affected Products & Versions

19
ntp<= 4.2.7
ntp>= 4.3.98 and < 4.3.100
ntpall versions
redhat enterprise linuxall versions
netapp data ontapall versions
netapp hci management nodeall versions
netapp solidfireall versions
netapp vasa provider for clustered data ontap>= 7.2
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD17 Apr 2020 · 04:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

8
suse-csafopenSUSE-SU-2024:11102-1
suse-csafopenSUSE-SU-2020:1007-1
suse-csafopenSUSE-SU-2020:0934-1
suse-csafSUSE-SU-2020:1823-1
suse-csafSUSE-SU-2020:14415-1
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.htmlMailing ListThird Party Advisory
http://support.ntp.org/bin/view/Main/NtpBug3592PatchVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1716665Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00004.htmlMailing ListThird Party Advisory
https://security.gentoo.org/glsa/202007-12Third Party Advisory
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