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TI-2019-01226 Aliases CVE-2019-1599GHSA-pp5p-9g8q-357j

Cisco NX-OS Software Netstack Denial of Service Vulnerability

Priority MEDIUM 59CWE-399Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-399 and the CVSS impact.

Summary

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).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.14283 96th percentileScored 2026-11-07
Fix Fixed Nexus 1000V Switch for Microsoft Hyper-V (Cisco): 5.2(1)SM3(2.1)Nexus 1000V Switch for VMware vSphere (Cisco): 5.2(1)SV3(4.1a)+9 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoNexus 1000V Switch for Microsoft Hyper-Vbefore 5.2(1)SM3(2.1)5.2(1)SM3(2.1)Patch availableCNA
CiscoNexus 1000V Switch for VMware vSpherebefore 5.2(1)SV3(4.1a)5.2(1)SV3(4.1a)Patch availableCNA
CiscoNexus 3000 Series Switchesbefore 7.0(3)I7(6); before 9.2(2)7.0(3)I7(6), 9.2(2)Patch availableCNA
CiscoNexus 3500 Platform Switchesbefore 6.0(2)A8(11); before 7.0(3)I7(6); before 9.2(2)6.0(2)A8(11), 7.0(3)I7(6), 9.2(2)Patch availableCNA
CiscoNexus 3600 Platform Switchesbefore 7.0(3)F3(5); before 9.2(2)7.0(3)F3(5), 9.2(2)Patch availableCNA
CiscoNexus 5500, 5600, and 6000 Series Switchesbefore 7.1(5)N1(1b); before 7.3(5)N1(1)7.1(5)N1(1b), 7.3(5)N1(1)Patch availableCNA
CiscoNexus 7000 and 7700 Series Switchesbefore 6.2(22); before 7.3(3)D1(1); before 8.2(3); before 8.3(2)6.2(22), 7.3(3)D1(1), 8.2(3), 8.3(2)Patch availableCNA
CiscoNexus 9000 Series Switches in Standalone NX-OS Modebefore 7.0(3)I7(6); before 9.2(2)7.0(3)I7(6), 9.2(2)Patch availableCNA
CiscoNexus 9500 R-Series Line Cards and Fabric Modulesbefore 7.0(3)F3(5); before 9.2(2)7.0(3)F3(5), 9.2(2)Patch availableCNA
CiscoUCS 6200 and 6300 Series Fabric Interconnectbefore 3.2(3j); before 4.0(2a)3.2(3j), 4.0(2a)Patch availableCNA
CiscoUCS 6400 Series Fabric Interconnectbefore 4.0(2a)4.0(2a)Patch availableCNA
  • Nexus 1000V Switch for Microsoft Hyper-V VendorCisco Affected before 5.2(1)SM3(2.1) Fixed in 5.2(1)SM3(2.1) Patch available CNA
  • Nexus 1000V Switch for VMware vSphere VendorCisco Affected before 5.2(1)SV3(4.1a) Fixed in 5.2(1)SV3(4.1a) Patch available CNA
  • Nexus 3000 Series Switches VendorCisco Affected before 7.0(3)I7(6); before 9.2(2) Fixed in 7.0(3)I7(6), 9.2(2) Patch available CNA
  • Nexus 3500 Platform Switches VendorCisco Affected before 6.0(2)A8(11); before 7.0(3)I7(6); before 9.2(2) Fixed in 6.0(2)A8(11), 7.0(3)I7(6), 9.2(2) Patch available CNA
  • Nexus 3600 Platform Switches VendorCisco Affected before 7.0(3)F3(5); before 9.2(2) Fixed in 7.0(3)F3(5), 9.2(2) Patch available CNA
  • Nexus 5500, 5600, and 6000 Series Switches VendorCisco Affected before 7.1(5)N1(1b); before 7.3(5)N1(1) Fixed in 7.1(5)N1(1b), 7.3(5)N1(1) Patch available CNA
  • Nexus 7000 and 7700 Series Switches VendorCisco Affected before 6.2(22); before 7.3(3)D1(1); before 8.2(3); before 8.3(2) Fixed in 6.2(22), 7.3(3)D1(1), 8.2(3), 8.3(2) Patch available CNA
  • Nexus 9000 Series Switches in Standalone NX-OS Mode VendorCisco Affected before 7.0(3)I7(6); before 9.2(2) Fixed in 7.0(3)I7(6), 9.2(2) Patch available CNA
  • Nexus 9500 R-Series Line Cards and Fabric Modules VendorCisco Affected before 7.0(3)F3(5); before 9.2(2) Fixed in 7.0(3)F3(5), 9.2(2) Patch available CNA
  • UCS 6200 and 6300 Series Fabric Interconnect VendorCisco Affected before 3.2(3j); before 4.0(2a) Fixed in 3.2(3j), 4.0(2a) Patch available CNA
  • UCS 6400 Series Fabric Interconnect VendorCisco Affected before 4.0(2a) Fixed in 4.0(2a) Patch available CNA

CPE configurations NVD · 22

CPEVersionsRoleVendor
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*9.2 to before 9.2\(2\)VulnerableCisco
cpe:2.3:h:cisco:nexus_3000:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:nexus_3500:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:nexus_3600:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*7.0\(3\) to before 7.0\(3\)i7\(5\); 7.0\(3\) to before 7.0\(3\)f3\(5\); 7.2 to before 7.3\(5\)n1\(1\)VulnerableCisco
cpe:2.3:h:cisco:nexus_5500:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:nexus_5600:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:nexus_6000:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*8.3 to before 8.3\(2\)VulnerableCisco
cpe:2.3:h:cisco:nexus_7000:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions 9.2 to before 9.2\(2\) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:nexus_3000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:nexus_3500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:nexus_3600:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions 7.0\(3\) to before 7.0\(3\)i7\(5\); 7.0\(3\) to before 7.0\(3\)f3\(5\); 7.2 to before 7.3\(5\)n1\(1\) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:nexus_5500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:nexus_5600:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:nexus_6000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions 8.3 to before 8.3\(2\) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:nexus_7000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 12 more CPE
CPEVersionsRoleVendor
cpe:2.3:h:cisco:nexus_7700:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:nexus_9000:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:nexus_9500:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*before 6.0\(2\)a8\(11\); before 6.2\(22\); 7.0\(3\)i5 to before 7.0\(3\)i7\(6\); before 5.2\(1\)sm3\(2.1\)VulnerableCisco
cpe:2.3:h:cisco:nexus_1000v:-:*:*:*:*:microsoft_hyper-v:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*before 5.2\(1\)sv3\(4.1a\)VulnerableCisco
cpe:2.3:h:cisco:nexus_1000v:-:*:*:*:*:vmware_vsphere:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*4.0 to before 4.0\(2a\)VulnerableCisco
cpe:2.3:h:cisco:ucs_6200:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:ucs_6300:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:ucs_6400:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*before 3.2\(3j\); before 7.0\(3\)i4\(9\); before 7.1\(5\)n1\(1b\); 8.0 to before 8.2\(3\); 7.2 to before 7.3\(3\)d1\(1\)VulnerableCisco
  • cpe:2.3:h:cisco:nexus_7700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:nexus_9000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:nexus_9500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions before 6.0\(2\)a8\(11\); before 6.2\(22\); 7.0\(3\)i5 to before 7.0\(3\)i7\(6\); before 5.2\(1\)sm3\(2.1\) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:nexus_1000v:-:*:*:*:*:microsoft_hyper-v:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions before 5.2\(1\)sv3\(4.1a\) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:nexus_1000v:-:*:*:*:*:vmware_vsphere:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions 4.0 to before 4.0\(2a\) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:ucs_6200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:ucs_6300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:ucs_6400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:* Versions before 3.2\(3j\); before 7.0\(3\)i4\(9\); before 7.1\(5\)n1\(1b\); 8.0 to before 8.2\(3\); 7.2 to before 7.3\(3\)d1\(1\) Vulnerable ·Cisco

Remediation

  • Fix · CNA Nexus 1000V Switch for Microsoft Hyper-V (Cisco) Fixed in 5.2(1)SM3(2.1)
  • Fix · CNA Nexus 1000V Switch for VMware vSphere (Cisco) Fixed in 5.2(1)SV3(4.1a)
  • Fix · CNA Nexus 3000 Series Switches (Cisco) Fixed in 7.0(3)I7(6), 9.2(2)
  • Fix · CNA Nexus 3500 Platform Switches (Cisco) Fixed in 6.0(2)A8(11), 7.0(3)I7(6), 9.2(2)
  • Fix · CNA Nexus 3600 Platform Switches (Cisco) Fixed in 7.0(3)F3(5), 9.2(2)
  • Fix · CNA Nexus 5500, 5600, and 6000 Series Switches (Cisco) Fixed in 7.1(5)N1(1b), 7.3(5)N1(1)
  • Fix · CNA Nexus 7000 and 7700 Series Switches (Cisco) Fixed in 6.2(22), 7.3(3)D1(1), 8.2(3), 8.3(2)
  • Fix · CNA Nexus 9000 Series Switches in Standalone NX-OS Mode (Cisco) Fixed in 7.0(3)I7(6), 9.2(2)
  • Fix · CNA Nexus 9500 R-Series Line Cards and Fabric Modules (Cisco) Fixed in 7.0(3)F3(5), 9.2(2)
  • Fix · CNA UCS 6200 and 6300 Series Fabric Interconnect (Cisco) Fixed in 3.2(3j), 4.0(2a)
  • Fix · CNA UCS 6400 Series Fabric Interconnect (Cisco) Fixed in 4.0(2a)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-1599
  2. 2026-10-03 Alias added: GHSA-pp5p-9g8q-357j

References

Patch 1

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2024-13332 Cisco NX-OS Software CLI Command Injection Vulnerability KEVCVSS 3.1MEDIUM 6.7
  • TI-2018-00260 Improper input validation in Cisco NX-OS unknown CVSS 3.0CRITICAL 9.8
  • TI-2022-05183 Cisco NX-OS Software Cisco Fabric Services Over IP Denial of Service Vulnerability CVSS 3.1HIGH 8.6
  • TI-2022-05182 Cisco Nexus 9000 Series Switches Bidirectional Forwarding Detection Denial of Service Vulnerability CVSS 3.1HIGH 8.6
  • TI-2022-05209 Cisco NX-OS Software NX-API Command Injection Vulnerability CVSS 3.1HIGH 8.8
See all 274 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences