Strix
26.1K

CVE-2019-1967

HIGHCVSS 7.5/10EPSS 1.97%

Last modified

CVE-2019-1967 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability in the Network Time Protocol (NTP) feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to excessive use of system resources when the affected device is logging a drop action for received MODE_PRIVATE (Mode 7) NTP packets. EPSS estimates a 1.97% chance of exploitation in the next 30 days.

Description

A vulnerability in the Network Time Protocol (NTP) feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to excessive use of system resources when the affected device is logging a drop action for received MODE_PRIVATE (Mode 7) NTP packets. An attacker could exploit this vulnerability by flooding the device with a steady stream of Mode 7 NTP packets. A successful exploit could allow the attacker to cause high CPU and memory usage on the affected device, which could cause internal system processes to restart or cause the affected device to unexpectedly reload. Note: The NTP feature is enabled by default.

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
1.97%

77.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoNx-Os6.2
CiscoNx-Os7.3
CiscoNx-Os8.1
CiscoNx-Os8.2
CiscoNx-Os8.3
CiscoNx-Os6.0\(2\)a8\(9.7\)
CiscoNx-Os6.0\(2\)u6
CiscoNx-Os7.0\(3\)i
CiscoNx-Os9.2
CiscoNx-Os9.2\(1\)
CiscoNx-Os6.0\(2\)a8
CiscoNx-Os7.0\(3\)i7
CiscoNx-Os7.0\(3\)f
CiscoNx-Os7.1\(4\)
CiscoNx-Os7.1\(4\)n1\(1\)
CiscoNx-Os7.1\(5\)
CiscoNx-Os7.2
CiscoNx-Os7.3\(2\)d1\(1\)
CiscoNx-Os8.0
CiscoNx-Os8.3\(2\)s5

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-1967?
A vulnerability in the Network Time Protocol (NTP) feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to excessive use of system resources when the affected device is logging a drop action for received MODE_PRIVATE (Mode 7) NTP packets. An attacker could exploit this vulnerability by flooding the device with a steady stream of Mode 7 NTP packets. A successful exploit could allow the attacker to cause high CPU and memory usage on the affected device, which could cause internal system processes to restart or cause the affected device to unexpectedly reload. Note: The NTP feature is enabled by default.
How severe is CVE-2019-1967?
CVE-2019-1967 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.97% probability of exploitation in the next 30 days.
How do I fix CVE-2019-1967?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-1967?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST