Vulnerability Monitor

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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.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 92 products from cisco, from cisco, from cisco and 89 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2019, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2019-08-30T09:15:20.287

Last Modified

2024-11-21T04:37:47.367

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: COMPLETE

Exploitability Score

10.0

Impact Score

6.9

Weaknesses

Type: Secondary
CWE-399
Type: Primary
CWE-400

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	cisco	nx-os	6.2	Yes
Operating System	cisco	nx-os	7.3	Yes
Operating System	cisco	nx-os	8.1	Yes
Operating System	cisco	nx-os	8.2	Yes
Operating System	cisco	nx-os	8.3	Yes
Hardware	cisco	mds_9000	-	No
Hardware	cisco	mds_9100	-	No
Hardware	cisco	mds_9140	-	No
Hardware	cisco	mds_9200	-	No
Hardware	cisco	mds_9500	-	No
Hardware	cisco	mds_9700	-	No
Operating System	cisco	nx-os	6.0\(2\)a8\(9.7\)	Yes
Operating System	cisco	nx-os	6.0\(2\)u6	Yes
Operating System	cisco	nx-os	7.0\(3\)i	Yes
Operating System	cisco	nx-os	9.2	Yes
Operating System	cisco	nx-os	9.2\(1\)	Yes
Hardware	cisco	nexus_3016	-	No
Hardware	cisco	nexus_3048	-	No
Hardware	cisco	nexus_3064	-	No
Hardware	cisco	nexus_3064-t	-	No
Hardware	cisco	nexus_31108pc-v	-	No
Hardware	cisco	nexus_31108tc-v	-	No
Hardware	cisco	nexus_31128pq	-	No
Hardware	cisco	nexus_3132c-z	-	No
Hardware	cisco	nexus_3132q	-	No
Hardware	cisco	nexus_3132q-v	-	No
Hardware	cisco	nexus_3132q-xl	-	No
Hardware	cisco	nexus_3164q	-	No
Hardware	cisco	nexus_3172	-	No
Hardware	cisco	nexus_3172pq-xl	-	No
Hardware	cisco	nexus_3172tq	-	No
Hardware	cisco	nexus_3172tq-32t	-	No
Hardware	cisco	nexus_3172tq-xl	-	No
Hardware	cisco	nexus_3232c	-	No
Hardware	cisco	nexus_3264c-e	-	No
Hardware	cisco	nexus_3264q	-	No
Hardware	cisco	nexus_3408-s	-	No
Hardware	cisco	nexus_34180yc	-	No
Hardware	cisco	nexus_3432d-s	-	No
Hardware	cisco	nexus_3464c	-	No
Hardware	cisco	nexus_9000v	-	No
Hardware	cisco	nexus_92160yc-x	-	No
Hardware	cisco	nexus_92300yc	-	No
Hardware	cisco	nexus_92304qc	-	No
Hardware	cisco	nexus_92348gc-x	-	No
Hardware	cisco	nexus_9236c	-	No
Hardware	cisco	nexus_9272q	-	No
Hardware	cisco	nexus_93108tc-ex	-	No
Hardware	cisco	nexus_93108tc-fx	-	No
Hardware	cisco	nexus_93120tx	-	No
Hardware	cisco	nexus_93128tx	-	No
Hardware	cisco	nexus_93180lc-ex	-	No
Hardware	cisco	nexus_93180yc-ex	-	No
Hardware	cisco	nexus_93180yc-fx	-	No
Hardware	cisco	nexus_93216tc-fx2	-	No
Hardware	cisco	nexus_93240yc-fx2	-	No
Hardware	cisco	nexus_9332c	-	No
Hardware	cisco	nexus_9332pq	-	No
Hardware	cisco	nexus_93360yc-fx2	-	No
Hardware	cisco	nexus_9336c-fx2	-	No
Hardware	cisco	nexus_9336pq_aci_spine	-	No
Hardware	cisco	nexus_9348gc-fxp	-	No
Hardware	cisco	nexus_9364c	-	No
Hardware	cisco	nexus_9372px	-	No
Hardware	cisco	nexus_9372px-e	-	No
Hardware	cisco	nexus_9372tx	-	No
Hardware	cisco	nexus_9372tx-e	-	No
Hardware	cisco	nexus_9396px	-	No
Hardware	cisco	nexus_9396tx	-	No
Operating System	cisco	nx-os	6.0\(2\)a8	Yes
Operating System	cisco	nx-os	6.0\(2\)a8\(9.7\)	Yes
Operating System	cisco	nx-os	7.0\(3\)i7	Yes
Operating System	cisco	nx-os	9.2	Yes
Hardware	cisco	nexus_3524	-	No
Hardware	cisco	nexus_3524-x	-	No
Hardware	cisco	nexus_3524-xl	-	No
Hardware	cisco	nexus_3548	-	No
Hardware	cisco	nexus_3548-x	-	No
Hardware	cisco	nexus_3548-xl	-	No
Operating System	cisco	nx-os	6.0\(2\)a8\(9.7\)	Yes
Operating System	cisco	nx-os	7.0\(3\)f	Yes
Operating System	cisco	nx-os	9.2	Yes
Operating System	cisco	nx-os	9.2\(1\)	Yes
Hardware	cisco	nexus_36180yc-r	-	No
Hardware	cisco	nexus_3636c-r	-	No
Hardware	cisco	nexus_9504	-	No
Hardware	cisco	nexus_9508	-	No
Hardware	cisco	nexus_9516	-	No
Operating System	cisco	nx-os	7.1\(4\)	Yes
Operating System	cisco	nx-os	7.1\(4\)n1\(1\)	Yes
Operating System	cisco	nx-os	7.1\(5\)	Yes
Operating System	cisco	nx-os	7.2	Yes
Operating System	cisco	nx-os	7.3	Yes
Hardware	cisco	nexus_5548p	-	No
Hardware	cisco	nexus_5548up	-	No
Hardware	cisco	nexus_5596t	-	No
Hardware	cisco	nexus_5596up	-	No
Hardware	cisco	nexus_56128p	-	No
Hardware	cisco	nexus_5624q	-	No
Hardware	cisco	nexus_5648q	-	No
Hardware	cisco	nexus_5672up	-	No
Hardware	cisco	nexus_5696q	-	No
Hardware	cisco	nexus_6001	-	No
Hardware	cisco	nexus_6004	-	No
Operating System	cisco	nx-os	6.2	Yes
Operating System	cisco	nx-os	7.2	Yes
Operating System	cisco	nx-os	7.3	Yes
Operating System	cisco	nx-os	7.3\(2\)d1\(1\)	Yes
Operating System	cisco	nx-os	8.0	Yes
Operating System	cisco	nx-os	8.1	Yes
Operating System	cisco	nx-os	8.2	Yes
Operating System	cisco	nx-os	8.3	Yes
Operating System	cisco	nx-os	8.3\(2\)s5	Yes
Hardware	cisco	nexus_7000	-	No
Hardware	cisco	nexus_7000_10-slot	-	No
Hardware	cisco	nexus_7000_18-slot	-	No
Hardware	cisco	nexus_7000_4-slot	-	No
Hardware	cisco	nexus_7000_9-slot	-	No
Hardware	cisco	nexus_7700	-	No
Hardware	cisco	nexus_7700_10-slot	-	No
Hardware	cisco	nexus_7700_18-slot	-	No
Hardware	cisco	nexus_7700_2-slot	-	No
Hardware	cisco	nexus_7700_6-slot	-	No

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nxos-ntp-dos Vendor Advisory ([email protected])
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nxos-ntp-dos Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.