Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

Go to Calendar     Go to Press Room     Go to Newsletters subscription

Search

CVE-2021-34714

Severity CVSS v4.0:
Pending analysis
Type:
CWE-20 Input Validation
Publication date:
23/09/2021
Last modified:
07/11/2023

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.

Impact

Vector 3.x
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.40 HIGH
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.40
Severity 3.x
HIGH
Vector 2.0
AV:A/AC:M/Au:N/C:N/I:N/A:C CVSS v2.0 Severity and Metrics:

Base Score: 5.70 MEDIUM
Vector: AV:A/AC:M/Au:N/C:N/I:N/A:C

Attack Vector (AV): Adjacent
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Complete

Base Score 2.0
5.70
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:h:cisco:firepower_4100:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_4110:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_4112:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_4115:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_4120:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_4125:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_4140:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_4145:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_4150:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_9300:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_9300_sm-24:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_9300_sm-36:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_9300_sm-40:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_9300_sm-44:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:firepower_9300_sm-44_x_3:-:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools