CVE-2021-34714 Information
Description
A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco FXOS Software Cisco IOS Software Cisco IOS XE Software Cisco IOS XR Software and Cisco NX-OS Software could allow an unauthenticated adjacent attacker to cause an affected device to reload. This vulnerability is due to improper input validation of the UDLD packets. An attacker could exploit this vulnerability by sending specifically crafted UDLD packets to an affected device. A successful exploit could allow the attacker to cause the affected device to reload resulting in a denial of service (DoS) condition. Note: The UDLD feature is disabled by default and the conditions to exploit this vulnerability are strict. An attacker must have full control of a directly connected device. On Cisco IOS XR devices the impact is limited to the reload of the UDLD process.
CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Reference
Attack Complexity
LOW
Privileges Required
NONE
User Interaction Required
NONE
Scope
NONE
Confidentiality Impact
CHANGED
Integrity Impact
NONE
Availability Impact
NONE
Base Score
HIGH
Base Severity
7.4
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