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.

Project Subscriptions

Vendors Products
Firepower 4100 Subscribe
Firepower 4110 Subscribe
Firepower 4112 Subscribe
Firepower 4115 Subscribe
Firepower 4120 Subscribe
Firepower 4125 Subscribe
Firepower 4140 Subscribe
Firepower 4145 Subscribe
Firepower 4150 Subscribe
Firepower 9300 Subscribe
Firepower 9300 Sm-24 Subscribe
Firepower 9300 Sm-36 Subscribe
Firepower 9300 Sm-40 Subscribe
Firepower 9300 Sm-44 Subscribe
Firepower 9300 Sm-44 X 3 Subscribe
Firepower 9300 Sm-48 Subscribe
Firepower 9300 Sm-56 Subscribe
Firepower 9300 Sm-56 X 3 Subscribe
Firepower 9300 With 1 Sm-24 Module Subscribe
Firepower 9300 With 1 Sm-36 Module Subscribe
Firepower 9300 With 1 Sm-44 Module Subscribe
Firepower 9300 With 3 Sm-44 Module Subscribe
Firepower Extensible Operating System Subscribe
Mds 9000 Subscribe
Mds 9100 Subscribe
Mds 9132t Subscribe
Mds 9134 Subscribe
Mds 9140 Subscribe
Mds 9148 Subscribe
Mds 9148s Subscribe
Mds 9148t Subscribe
Mds 9200 Subscribe
Mds 9216 Subscribe
Mds 9216a Subscribe
Mds 9216i Subscribe
Mds 9222i Subscribe
Mds 9250i Subscribe
Mds 9396s Subscribe
Mds 9396t Subscribe
Mds 9500 Subscribe
Mds 9506 Subscribe
Mds 9509 Subscribe
Mds 9513 Subscribe
Mds 9700 Subscribe
Mds 9706 Subscribe
Mds 9710 Subscribe
Mds 9718 Subscribe
Nexus 3000 Subscribe
Nexus 3016 Subscribe
Nexus 3016q Subscribe
Nexus 3048 Subscribe
Nexus 3064 Subscribe
Nexus 3064-32t Subscribe
Nexus 3064-t Subscribe
Nexus 3064-x Subscribe
Nexus 3064t Subscribe
Nexus 3064x Subscribe
Nexus 3100 Subscribe
Nexus 3100-v Subscribe
Nexus 3100-z Subscribe
Nexus 3100v Subscribe
Nexus 31108pc-v Subscribe
Nexus 31108pv-v Subscribe
Nexus 31108tc-v Subscribe
Nexus 31128pq Subscribe
Nexus 3132c-z Subscribe
Nexus 3132q Subscribe
Nexus 3132q-v Subscribe
Nexus 3132q-x Subscribe
Nexus 3132q-x\/3132q-xl Subscribe
Nexus 3132q-xl Subscribe
Nexus 3164q Subscribe
Nexus 3172 Subscribe
Nexus 3172pq Subscribe
Nexus 3172pq-xl Subscribe
Nexus 3172pq\/pq-xl Subscribe
Nexus 3172tq Subscribe
Nexus 3172tq-32t Subscribe
Nexus 3172tq-xl Subscribe
Nexus 3200 Subscribe
Nexus 3232c Subscribe
Nexus 3232c Subscribe
Nexus 3264c-e Subscribe
Nexus 3264q Subscribe
Nexus 3400 Subscribe
Nexus 3408-s Subscribe
Nexus 34180yc Subscribe
Nexus 34200yc-sm Subscribe
Nexus 3432d-s Subscribe
Nexus 3464c Subscribe
Nexus 3500 Subscribe
Nexus 3500 Platform Subscribe
Nexus 3524 Subscribe
Nexus 3524-x Subscribe
Nexus 3524-x\/xl Subscribe
Nexus 3524-xl Subscribe
Nexus 3548 Subscribe
Nexus 3548-x Subscribe
Nexus 3548-x\/xl Subscribe
Nexus 3548-xl Subscribe
Nexus 3600 Subscribe
Nexus 36180yc-r Subscribe
Nexus 3636c-r Subscribe
Nexus 5000 Subscribe
Nexus 5010 Subscribe
Nexus 5020 Subscribe
Nexus 5500 Subscribe
Nexus 5548p Subscribe
Nexus 5548up Subscribe
Nexus 5596t Subscribe
Nexus 5596up Subscribe
Nexus 5600 Subscribe
Nexus 56128p Subscribe
Nexus 5624q Subscribe
Nexus 5648q Subscribe
Nexus 5672up Subscribe
Nexus 5672up-16g Subscribe
Nexus 5696q Subscribe
Nexus 6000 Subscribe
Nexus 6001 Subscribe
Nexus 6001p Subscribe
Nexus 6001t Subscribe
Nexus 6004 Subscribe
Nexus 6004x Subscribe
Nexus 7000 Subscribe
Nexus 7000 10-slot Subscribe
Nexus 7000 18-slot Subscribe
Nexus 7000 4-slot Subscribe
Nexus 7000 9-slot Subscribe
Nexus 7000 Supervisor 1 Subscribe
Nexus 7000 Supervisor 2 Subscribe
Nexus 7000 Supervisor 2e Subscribe
Nexus 7004 Subscribe
Nexus 7009 Subscribe
Nexus 7010 Subscribe
Nexus 7018 Subscribe
Nexus 7700 Subscribe
Nexus 7700 10-slot Subscribe
Nexus 7700 18-slot Subscribe
Nexus 7700 2-slot Subscribe
Nexus 7700 6-slot Subscribe
Nexus 7700 Supervisor 2e Subscribe
Nexus 7700 Supervisor 3e Subscribe
Nexus 7702 Subscribe
Nexus 7706 Subscribe
Nexus 7710 Subscribe
Nexus 7718 Subscribe
Nexus 9000 Subscribe
Nexus 9000 In Aci Mode Subscribe
Nexus 9000 In Standalone Subscribe
Nexus 9000 In Standalone Nx-os Mode Subscribe
Nexus 9000v Subscribe
Nexus 9200 Subscribe
Nexus 92160yc-x Subscribe
Nexus 9221c Subscribe
Nexus 92300yc Subscribe
Nexus 92304qc Subscribe
Nexus 92348gc-x Subscribe
Nexus 9236c Subscribe
Nexus 9272q Subscribe
Nexus 9300 Subscribe
Nexus 93108tc-ex Subscribe
Nexus 93108tc-ex-24 Subscribe
Nexus 93108tc-fx Subscribe
Nexus 93108tc-fx-24 Subscribe
Nexus 93108tc-fx3p Subscribe
Nexus 93120tx Subscribe
Nexus 93128 Subscribe
Nexus 93128tx Subscribe
Nexus 9316d-gx Subscribe
Nexus 93180lc-ex Subscribe
Nexus 93180tc-ex Subscribe
Nexus 93180yc-ex Subscribe
Nexus 93180yc-ex-24 Subscribe
Nexus 93180yc-fx Subscribe
Nexus 93180yc-fx-24 Subscribe
Nexus 93180yc-fx3 Subscribe
Nexus 93180yc-fx3s Subscribe
Nexus 93216tc-fx2 Subscribe
Nexus 93240yc-fx2 Subscribe
Nexus 9332c Subscribe
Nexus 9332pq Subscribe
Nexus 93360yc-fx2 Subscribe
Nexus 9336c-fx2 Subscribe
Nexus 9336c-fx2-e Subscribe
Nexus 9336pq Subscribe
Nexus 9336pq Aci Spine Subscribe
Nexus 9348gc-fxp Subscribe
Nexus 93600cd-gx Subscribe
Nexus 9364c Subscribe
Nexus 9364c-gx Subscribe
Nexus 9372px Subscribe
Nexus 9372px-e Subscribe
Nexus 9372tx Subscribe
Nexus 9372tx-e Subscribe
Nexus 9396px Subscribe
Nexus 9396tx Subscribe
Nexus 9500 Subscribe
Nexus 9500 Supervisor A Subscribe
Nexus 9500 Supervisor A\+ Subscribe
Nexus 9500 Supervisor B Subscribe
Nexus 9500 Supervisor B\+ Subscribe
Nexus 9500r Subscribe
Nexus 9504 Subscribe
Nexus 9508 Subscribe
Nexus 9516 Subscribe
Ucs 6200 Subscribe
Ucs 6248 Up Fabric Interconnect Subscribe
Ucs 6248up Subscribe
Ucs 6296 Up Fabric Interconnect Subscribe
Ucs 6296up Subscribe
Ucs 6300 Subscribe
Ucs 6324 Subscribe
Ucs 6324 Fabric Interconnect Subscribe
Ucs 6332 Subscribe
Ucs 6332-16up Subscribe
Ucs 6332-16up Fabric Interconnect Subscribe
Ucs 6332 Fabric Interconnect Subscribe
Ucs 6400 Subscribe
Ucs 6454 Subscribe
Advisories
Source ID Title
EUVD EUVD EUVD-2021-21364 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.
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 07 Nov 2024 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2024-11-07T21:59:09.403Z

Reserved: 2021-06-15T00:00:00

Link: CVE-2021-34714

cve-icon Vulnrichment

Updated: 2024-08-04T00:19:48.217Z

cve-icon NVD

Status : Modified

Published: 2021-09-23T03:15:18.153

Modified: 2024-11-21T06:11:01.790

Link: CVE-2021-34714

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses