PT-2021-4497 · Cisco · Cisco Nx-Os+5

Marco Cassini

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Published

2021-09-22

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Updated

2023-04-20

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CVE-2021-34714

CVSS v3.1

7.4

High

VectorAV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Name of the Vulnerable Software and Affected Versions Cisco FXOS Software (affected versions not specified) Cisco IOS Software (affected versions not specified) Cisco IOS XE Software (affected versions not specified) Cisco IOS XR Software (affected versions not specified) Cisco NX-OS Software (affected versions not specified)
Description A vulnerability in the Unidirectional Link Detection (UDLD) feature 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. 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.
Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2021-05131
CVE-2021-34714

Affected Products

Cisco Fxos
Cisco Ios
Cisco Ios Xe
Cisco Ios Xr
Cisco Nx-Os
Cisco Nexus