CVE-2020-13817

Ntp vulnerability

CVSS

7.4

EPSS

4.1%

EPSS pct

90th

Exploited

No known

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.

Affected vendor

Ntp

Affected product

Ntp

CVSS vector

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

Weakness type (CWE)

CWE-330 — Use of Insufficiently Random Values

Published

2020-06-04

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to integrity, high impact to availability.

Its EPSS score of 4.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2020-13817

Confirm whether Ntp Ntp is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2020-13817.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-13817

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