Vulnerability · Published Feb 26, 2020 · Assigned by cisco

CVE-2020-3174Cisco NX-OS Software Anycast Gateway Invalid ARP Vulnerability

Medium 4.7

In plain English

A medium-severity insufficient verification of data authenticity in Cisco NX-OS Software 7.3(2)D1(1d) from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.0)4.7Medium

Exploit odds (30 days)0.3%top 78.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A vulnerability in the anycast gateway feature of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a device to learn invalid Address Resolution Protocol (ARP) entries. The ARP entries are for nonlocal IP addresses for the subnet. The vulnerability is due to improper validation of a received gratuitous ARP (GARP) request. An attacker could exploit this vulnerability by sending a malicious GARP packet on the local subnet to cause the ARP table on the device to become corrupted. A successful exploit could allow the attacker to populate the ARP table with incorrect entries, which could lead to traffic disruptions.

Affected products (as reported)

Vendor	Product	Versions
Cisco	Cisco NX-OS Software 7.3(2)D1(1d)	unspecified – before n/a

Weakness: CWE-345 · Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

References

20200226 Cisco NX-OS Software Anycast Gateway Invalid ARP Vulnerability vendor-advisory, x_refsource_CISCO