Vulnerability identifier: #VU28558

Vulnerability risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-10136

CWE-ID: CWE-19

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco NX-OS
Operating systems & Components / Operating system
Nexus 1000 Virtual Edge for VMware vSphere
Server applications / Other server solutions
Nexus 1000V Switch for Microsoft Hyper-V
Hardware solutions / Routers & switches, VoIP, GSM, etc
Nexus 1000V Switch for VMware vSphere
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Nexus 3000 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Nexus 5500 Platform Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Nexus 5600 Platform Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Nexus 6000 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Nexus 7000 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Nexus 9000 Series Switches NX-OS Mode
Hardware solutions / Routers & switches, VoIP, GSM, etc
UCS 6200 Series Fabric Interconnects
Hardware solutions / Routers & switches, VoIP, GSM, etc
UCS 6300 Series Fabric Interconnects
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the affected device unexpectedly decapsulating and processing IP in IP packets that are destined to a locally configured IP address. A remote attacker can send a specially crafted IP in IP packet and cause a denial of service condition on the target device.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco NX-OS: All versions

Nexus 1000 Virtual Edge for VMware vSphere: 5.2.1 SV5.1.3

Nexus 1000V Switch for Microsoft Hyper-V: 5.2.1 SV3.4.1b

Nexus 1000V Switch for VMware vSphere: 5.2.1 SV3.4.1b

Cisco Nexus 3000 Series Switches: 5.0.3 U5.1f - 6.0.2 U2.4.92.4Z

Nexus 5500 Platform Switches: 7.3.7 N1.1

Nexus 5600 Platform Switches: 7.3.7 N1.1

Cisco Nexus 6000 Series Switches: 7.3.7 N1.1

Cisco Nexus 7000 Series Switches: 6.2.24 - 7.3.5 D1.1

Cisco Nexus 9000 Series Switches NX-OS Mode: 5.0.3 U5.1f - 6.0.2 U2.4.92.4Z

UCS 6200 Series Fabric Interconnects: 3.2.3n A

UCS 6300 Series Fabric Interconnects: 3.2.3n A

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External links
http://kb.cert.org/vuls/id/636397/
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipip-dos-kCT9X4
http://www.digi.com/resources/security

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.