Cisco NX-OS Software NX-API Denial of Service Vulnerability

Published 7 y ago 2019-08-29 · modified 4 mo ago 2026-06-17 · JSON

CVSS

5.3

v3.0 · CNA

CISA KEV

not known exploited

EPSS

1.8%

percentile 78%

Public exploits

none known

A vulnerability in the NX-API feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an NX-API system process to unexpectedly restart. The vulnerability is due to incorrect validation of the HTTP header of a request that is sent to the NX-API. An attacker could exploit this vulnerability by sending a crafted HTTP request to the NX-API on an affected device. A successful exploit could allow the attacker to cause a denial of service (DoS) condition in the NX-API service; however, the NX-OS device itself would still be available and passing network traffic. Note: The NX-API feature is disabled by default.

CISA SSVC assessment

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 23 mo ago 2024-11-19

Exploit prediction (EPSS)

1.77% probability of exploitation in the next 30 days, higher than 78% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
CNA	3.0	5.3	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`
NVD	3.1	7.5	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
CNA	3.0	5.3	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`
NVD	2.0	5.0	`AV:N/AC:L/Au:N/C:N/I:N/A:P`

Affected products

Cisco Cisco NX-OS Software 6.0(2)A4(1)

Classification

Weakness

CWE-20 Improper Input Validation
CWE-116 Improper Encoding or Escaping of Output

References

tools.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nxos-api-dos · vendor-advisory, x_refsource_CISCO, x_transferred

Sources

CVE List: CVE-2019-1968
NVD: CVE-2019-1968

vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.

Summary