CVE-2020-13817

HIGHScheduled

Published:Jun 4, 2020(5 years ago)

Modified:May 5, 2025

Remote ExploitNo Auth RequiredNo Interaction

Vulnerability Description

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.

Attack Characteristics

Network AccessHigh ComplexityNo Auth NeededNo User Interaction

🤖

AI analysis not yet available

Plain-English explanation, risk summary, and remediation steps will appear here once AI analysis is complete.

No Fix Known

No patch has been released yet. Apply workarounds or mitigations where available.

Affected Software

Vendor	Product	Versions	Fixed In
ntp	ntp	-	-
ntp	ntp	-	-
ntp	ntp	-

Timeline

Published
CVE disclosed publicly
Jun 4, 20205 years ago
Last Modified
Most recent update
May 5, 20251 year ago
Indexed to CVEInsight
Added to this platform
Mar 29, 20261 month ago

References

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005....Mailing List
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044....Mailing List
http://support.ntp.org/bin/view/Main/NtpBug3596Vendor Advisory

CVSS Score

v3.1

7.4/ 10.0

HIGH

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

At a Glance

Affected Products

References

ntp / ntp +58 more

https://bugs.ntp.org/show_bug.cgi?id=3596Issue Tracking

https://security.gentoo.org/glsa/202007-12Third Party Advisory

https://security.netapp.com/advisory/ntap-20200625-0004/Third Party Advisory

https://www.oracle.com/security-alerts/cpujan2022.htmlPatch

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005....Mailing List

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044....Mailing List

http://support.ntp.org/bin/view/Main/NtpBug3596Vendor Advisory

https://bugs.ntp.org/show_bug.cgi?id=3596Issue Tracking

https://security.gentoo.org/glsa/202007-12Third Party Advisory

https://security.netapp.com/advisory/ntap-20200625-0004/Third Party Advisory

https://www.oracle.com/security-alerts/cpujan2022.htmlPatch

CVSS v3 Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

Impact

ScopeUnchanged

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

Impact Analysis

ConfidentialityNone

NoneLowHigh

IntegrityHigh

NoneLowHigh

AvailabilityHigh

NoneLowHigh

CVE-2020-13817

✦ Vulnerability Description

Attack Characteristics

Affected Software

Timeline

References

CVSS Score

At a Glance

Official Sources

CVSS v3 Vector

Impact Analysis

Vulnerability Description