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CVE-2018-0372: A vulnerability in the DHCPv6 feature of the Cisco Nexus 9000 Series Fabric Switches in Application-Centric...

A vulnerability in the DHCPv6 feature of the Cisco Nexus 9000 Series Fabric Switches in Application-Centric Infrastructure (ACI) Mode could allow an unauthenticated, remote attacker to cause the device to run low on system memory, which could result in a Denial of Service (DoS) condition on an affected system. The vulnerability is due to improper memory management when DHCPv6 packets are received on an interface of the targeted device. An attacker could exploit this vulnerability by sending a high number of malicious DHCPv6 packets to be processed by an affected device. A successful exploit could allow the attacker to cause the system to run low on memory, which could cause an eventual reboot of an affected device. The vulnerability only applies to IPv6 protocol packets and not for IPv4 protocol packets. This vulnerability affects Cisco Nexus 9000 Series Fabric Switches in ACI Mode running software version 13.0(1k). The vulnerability can only be exploited when unicast routing is enabled on the Bridge Domain (BD). DHCP and DHCP relay do not have to be configured for the vulnerability to be exploited. Cisco Bug IDs: CSCvg38918.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

This flaw can let a remote, unauthenticated actor push certain Cisco Nexus 9000 ACI fabric switches into low memory and possible reboot. The business risk is network disruption, not data theft. Exposure is narrow: Cisco Nexus 9000 Series Fabric Switches in ACI Mode, software 13.0(1k), IPv6 traffic, with unicast routing enabled on the Bridge Domain. Likely exposure is limited to environments running Cisco Nexus 9000 fabric switches in ACI Mode on software 13.0(1k), with IPv6 reachable interfaces and unicast routing enabled on affected Bridge Domains. Treat this as urgent for any exposed ACI fabric on version 13.0(1k), because a rebooting fabric switch can disrupt dependent services. If the version or Bridge Domain condition is absent, urgency drops significantly. Mitigation focus: Review Cisco advisory cisco-20180718-nexus-9000-dos for fixed software and official workarounds.; Prioritize upgrades or configuration changes for exposed ACI fabric switches on version 13.0(1k).; Evaluate whether affected Bridge Domains require unicast routing; change only under approved network guidance..

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Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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2Source links

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Affected products

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VendorProductVersion / packageStatus
n/aCisco Nexus 9000 Series unknownCisco Nexus 9000 Series unknownListed
Weakness

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