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Fencer Vulns
high 8.6

CVE-2019-1599 in the critical feed json

Cisco NX-OS Software Netstack Denial of Service Vulnerability

published 2019-03-07 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-10156

cvss
8.6
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
14.3%
EPSS 14.3% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

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).

Patch / fix

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

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
23 mo ago

Exploit prediction

14.28% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 8.6 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • Cisco Nexus 1000V Switch for Microsoft Hyper-V
  • Cisco Nexus 1000V Switch for VMware vSphere
  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3500 Platform Switches
  • Cisco Nexus 3600 Platform Switches
  • Cisco Nexus 5500, 5600, and 6000 Series Switches
  • Cisco Nexus 7000 and 7700 Series Switches
  • Cisco Nexus 9000 Series Switches in Standalone NX-OS Mode
  • Cisco Nexus 9500 R-Series Line Cards and Fabric Modules
  • Cisco UCS 6200 and 6300 Series Fabric Interconnect
  • Cisco UCS 6400 Series Fabric Interconnect

Classification

Weakness
  • CWE-399 Resource Management Errors
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.