Cisco NX-OS Software Netstack Denial of Service Vulnerability

Description

A vulnerability in the network stack of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on the affected device. The vulnerability is due to an issue with allocating and freeing memory buffers in the network stack. An attacker could exploit this vulnerability by sending crafted TCP streams to an affected device in a sustained way. A successful exploit could cause the network stack of an affected device to run out of available buffers, impairing operations of control plane and management plane protocols, resulting in a DoS condition. Note: This vulnerability can be triggered only by traffic that is destined to an affected device and cannot be exploited using traffic that transits an affected device. Nexus 1000V Switch for Microsoft Hyper-V is affected in versions prior to 5.2(1)SM3(2.1). Nexus 1000V Switch for VMware vSphere is affected in versions prior to 5.2(1)SV3(4.1a). Nexus 3000 Series Switches are affected in versions prior to 7.0(3)I7(6) and 9.2(2). Nexus 3500 Platform Switches are affected in versions prior to 6.0(2)A8(11), 7.0(3)I7(6), and 9.2(2). Nexus 3600 Platform Switches are affected in versions prior to 7.0(3)F3(5) and 9.2(2). Nexus 5500, 5600, and 6000 Series Switches are affected in versions prior to 7.1(5)N1(1b) and 7.3(5)N1(1). Nexus 7000 and 7700 Series Switches are affected in versions prior to 6.2(22. Nexus 9500 R-Series Line Cards and Fabric Modules are affected in versions prior to 7.0(3)F3(5) and 9.2(2). UCS 6200 and 6300 Series Fabric Interconnect are affected in versions prior to 3.2(3j) and 4.0(2a). UCS 6400 Series Fabric Interconnect are affected in versions prior to 4.0(2a).

Scores

EPSS (exploitation in 30 days)

14.3% · top 3.4% of all CVEs (5 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.

Weakness

• CWE-399 (opens in a new tab)All about CWE-399 and its CVEs
• CWE-770 (opens in a new tab)All about CWE-770 and its CVEs

Affected products

• Cisco · Nexus 1000V Switch for Microsoft Hyper-V

  • affected unspecified – < 5.2(1)SM3(2.1)

• Cisco · Nexus 1000V Switch for VMware vSphere

  • affected unspecified – < 5.2(1)SV3(4.1a)

• Cisco · Nexus 3000 Series Switches

  • affected unspecified – < 7.0(3)I7(6)
  • affected unspecified – < 9.2(2)

• Cisco · Nexus 3500 Platform Switches

  • affected unspecified – < 6.0(2)A8(11)
  • affected unspecified – < 7.0(3)I7(6)
  • affected unspecified – < 9.2(2)

• Cisco · Nexus 3600 Platform Switches

  • affected unspecified – < 7.0(3)F3(5)
  • affected unspecified – < 9.2(2)

• Cisco · Nexus 5500, 5600, and 6000 Series Switches

  • affected unspecified – < 7.1(5)N1(1b)
  • affected unspecified – < 7.3(5)N1(1)

• Cisco · Nexus 7000 and 7700 Series Switches

  • affected unspecified – < 6.2(22)
  • affected unspecified – < 7.3(3)D1(1)
  • affected unspecified – < 8.2(3)
  • affected unspecified – < 8.3(2)

• Cisco · Nexus 9000 Series Switches in Standalone NX-OS Mode

  • affected unspecified – < 7.0(3)I7(6)
  • affected unspecified – < 9.2(2)

• Cisco · Nexus 9500 R-Series Line Cards and Fabric Modules

  • affected unspecified – < 7.0(3)F3(5)
  • affected unspecified – < 9.2(2)

• Cisco · UCS 6200 and 6300 Series Fabric Interconnect

  • affected unspecified – < 3.2(3j)
  • affected unspecified – < 4.0(2a)

• Cisco · UCS 6400 Series Fabric Interconnect

  • affected unspecified – < 4.0(2a)

What to do

Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References (2)

• 20190306 Cisco NX-OS Software Netstack Denial of Service Vulnerability (opens in a new tab)vendor-advisoryx_refsource_CISCOx_transferred
• 107342 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2019-1599](https://trackcve.app/badge/CVE-2019-1599.svg)](https://trackcve.app/cve/CVE-2019-1599)

Record last updated 19 Nov 2024, 19:15 UTC.