CVE-2020-3120: cisco cisco ios xr software Integer Overflow or Wraparound

Vulnerability summary

CVE-2020-3120 is a high (CVSS 7.4) Integer Overflow or Wraparound vulnerability in cisco cisco ios xr software. EPSS estimates a 1.64% chance of exploitation in the next 30 days, higher than 75.9% of scored vulnerabilities.

Timeline

1. 05-02-2020
   PublishedVulnerability first disclosed.
2. 15-11-2024
   Last modifiedVulnerability information updated.

Description

A vulnerability in the Cisco Discovery Protocol implementation for Cisco FXOS Software, Cisco IOS XR Software, and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a missing check when the affected software processes Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to exhaust system memory, causing the device to reload. Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.