CVE-2019-1599

Cisco NX-OS Software Netstack Denial of Service Vulnerability

HIGH

8.6

CVSS Score

Published: March 7, 2019 at 08:00 PM UTC

Updated: June 17, 2026 at 02:28 AM UTC

18 products affected across 1 vendorNx OSUcs 6300Ucs 6200

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Severity

HIGH8.6

Exploit prediction

EPSS 14%

SSVC

No known exploit

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nx OS · Cisconpm

95%

v < 3.2(3j)v < 5.2(1)sm3(2.1)v < 5.2(1)sv3(4.1a)v < 6.0(2)a8(11)v < 6.2(22)v < 7.0(3)i4(9)v < 7.1(5)n1(1b)4.0 ≤ v < 4.0(2a)7.0(3) ≤ v < 7.0(3)f3(5)7.0(3) ≤ v < 7.0(3)i7(5)7.0(3)i5 ≤ v < 7.0(3)i7(6)7.2 ≤ v < 7.3(3)d1(1)7.2 ≤ v < 7.3(5)n1(1)8.0 ≤ v < 8.2(3)8.3 ≤ v < 8.3(2)9.2 ≤ v < 9.2(2)

Affected range stops below 3.2(3j), so it looks safe — our inference, not a vendor statement

Affected range stops below 4.0(2a), so it looks safe — our inference, not a vendor statement

Affected range stops below 5.2(1)sm3(2.1), so it looks safe — our inference, not a vendor statement

Affected range stops below 5.2(1)sv3(4.1a), so it looks safe — our inference, not a vendor statement

Affected range stops below 6.0(2)a8(11), so it looks safe — our inference, not a vendor statement

Affected range stops below 6.2(22), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.0(3)f3(5), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.0(3)i4(9), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.0(3)i7(5), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.0(3)i7(6), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.1(5)n1(1b), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(3)d1(1), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(5)n1(1), so it looks safe — our inference, not a vendor statement

Affected range stops below 8.2(3), so it looks safe — our inference, not a vendor statement

Affected range stops below 8.3(2), so it looks safe — our inference, not a vendor statement

Affected range stops below 9.2(2), so it looks safe — our inference, not a vendor statement

cisco-nexus-1000v (environment) · cisco-nexus-3000 (environment) · cisco-nexus-3500 (environment) · cisco-nexus-3600 (environment) · cisco-nexus-5500 (environment) · cisco-nexus-5600 (environment) · cisco-nexus-6000 (environment) · cisco-nexus-7000 (environment) · cisco-nexus-7700 (environment) · cisco-nexus-9000 (environment) · cisco-nexus-9500 (environment) · cisco-ucs-6200 (environment) · cisco-ucs-6300 (environment) · cisco-ucs-6400 (environment)

Nexus 1000V · Cisco

60%

v < 5.2(1)SM3(2.1)v < 5.2(1)SV3(4.1a)

Affected range stops below 5.2(1)SM3(2.1), so it looks safe — our inference, not a vendor statement

Affected range stops below 5.2(1)SV3(4.1a), so it looks safe — our inference, not a vendor statement

Nexus 3000 · Cisco

60%

v < 7.0(3)I7(6)v < 9.2(2)

Affected range stops below 7.0(3)I7(6), so it looks safe — our inference, not a vendor statement

Affected range stops below 9.2(2), so it looks safe — our inference, not a vendor statement

Nexus 3500 · Cisco

60%

v < 6.0(2)A8(11)v < 7.0(3)I7(6)v < 9.2(2)

Affected range stops below 6.0(2)A8(11), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.0(3)I7(6), so it looks safe — our inference, not a vendor statement

Affected range stops below 9.2(2), so it looks safe — our inference, not a vendor statement

Nexus 3600 · Cisco

60%

v < 7.0(3)F3(5)v < 9.2(2)

Affected range stops below 7.0(3)F3(5), so it looks safe — our inference, not a vendor statement

Affected range stops below 9.2(2), so it looks safe — our inference, not a vendor statement

Nexus 5500 · Cisco

60%

v < 7.1(5)N1(1b)v < 7.3(5)N1(1)

Affected range stops below 7.1(5)N1(1b), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(5)N1(1), so it looks safe — our inference, not a vendor statement

Nexus 5600 · Cisco

60%

v < 7.1(5)N1(1b)v < 7.3(5)N1(1)

Affected range stops below 7.1(5)N1(1b), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(5)N1(1), so it looks safe — our inference, not a vendor statement

Nexus 6000 · Cisco

60%

v < 7.1(5)N1(1b)v < 7.3(5)N1(1)

Affected range stops below 7.1(5)N1(1b), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(5)N1(1), so it looks safe — our inference, not a vendor statement

Nexus 7000 · Cisco

60%

v < 6.2(22)v < 7.3(3)D1(1)v < 8.2(3)v < 8.3(2)

Affected range stops below 6.2(22), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(3)D1(1), so it looks safe — our inference, not a vendor statement

Affected range stops below 8.2(3), so it looks safe — our inference, not a vendor statement

Affected range stops below 8.3(2), so it looks safe — our inference, not a vendor statement

Nexus 7700 · Cisco

60%

v < 6.2(22)v < 7.3(3)D1(1)v < 8.2(3)v < 8.3(2)

Affected range stops below 6.2(22), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(3)D1(1), so it looks safe — our inference, not a vendor statement

Affected range stops below 8.2(3), so it looks safe — our inference, not a vendor statement

Affected range stops below 8.3(2), so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-netstack

References (2)

VDB Entryx_refsource_BIDThird Party Advisory

Source: [email protected]

http://www.securityfocus.com/bid/107342

Vendor Advisoryx_refsource_CISCOPatch

Source: [email protected]

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-netstack

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.6HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: CHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-399CWE-770

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