high
7.4
CWE
20
Advisory Published
Updated

CVE-2021-34714: Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability

First published: Thu Sep 23 2021(Updated: )

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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco FXOS>=2.2<2.2.2.148
Cisco FXOS>=2.3<2.3.1.216
Cisco FXOS>=2.4<2.4.1.273
Cisco FXOS>=2.6<2.6.1.224
Cisco FXOS>=2.7<2.7.1.143
Cisco FXOS>=2.8<2.8.1.143
Cisco FXOS>=2.9<2.9.1.135
Cisco Firepower 4100
Cisco Firepower 4110
Cisco Firepower 4112
Cisco Firepower 4115
Cisco Firepower 4120
Cisco Firepower 4125
Cisco Firepower 4140
Cisco Firepower 4145
Cisco Firepower 4150
Cisco Firepower 9300
Cisco Firepower 9300 Sm-24
Cisco Firepower 9300 Sm-36
Cisco Firepower 9300 Sm-40
Cisco Firepower 9300 Sm-44
Cisco Firepower 9300 Sm-44 X 3
Cisco Firepower 9300 Sm-48
Cisco Firepower 9300 Sm-56
Cisco Firepower 9300 Sm-56 X 3
Cisco Firepower 9300 With 1 Sm-24 Module
Cisco Firepower 9300 With 1 Sm-36 Module
Cisco Firepower 9300 With 1 Sm-44 Module
Cisco Firepower 9300 With 3 Sm-44 Module
Cisco Firepower Extensible Operating System<=8.4\(3.115\)
Cisco IOS<=8.4\(3.115\)
Cisco IOS XE<=8.4\(3.115\)
Cisco IOS XR<=8.4\(3.115\)
Cisco Nx-os<=8.4\(3.115\)
Cisco MDS 9000
Cisco Mds 9100
Cisco Mds 9132t
Cisco Mds 9134
Cisco Mds 9140
Cisco Mds 9148
Cisco Mds 9148s
Cisco Mds 9148t
Cisco Mds 9200
Cisco Mds 9216
Cisco Mds 9216a
Cisco Mds 9216i
Cisco Mds 9222i
Cisco Mds 9250i
Cisco Mds 9396s
Cisco Mds 9396t
Cisco Mds 9500
Cisco Mds 9506
Cisco Mds 9509
Cisco Mds 9513
Cisco Mds 9700
Cisco Mds 9706
Cisco Mds 9710
Cisco Mds 9718
Cisco Nexus 7000
Cisco Nexus 7000 10-slot
Cisco Nexus 7000 18-slot
Cisco Nexus 7000 4-slot
Cisco Nexus 7000 9-slot
Cisco Nexus 7000 Supervisor 1
Cisco Nexus 7000 Supervisor 2
Cisco Nexus 7000 Supervisor 2e
Cisco Nexus 7004
Cisco Nexus 7009
Cisco Nexus 7010
Cisco Nexus 7018
Cisco Nexus 7700
Cisco Nexus 7700 10-slot
Cisco Nexus 7700 18-slot
Cisco Nexus 7700 2-slot
Cisco Nexus 7700 6-slot
Cisco Nexus 7700 Supervisor 2e
Cisco Nexus 7700 Supervisor 3e
Cisco Nexus 7702
Cisco Nexus 7706
Cisco Nexus 7710
Cisco Nexus 7718
Cisco Firepower Extensible Operating System<=7.0\(3\)i7\(9\)
Cisco IOS<=7.0\(3\)i7\(9\)
Cisco IOS XE<=7.0\(3\)i7\(9\)
Cisco IOS XR<=7.0\(3\)i7\(9\)
Cisco Nx-os<=7.0\(3\)i7\(9\)
Cisco Nexus 3000
Cisco Nexus 3016
Cisco Nexus 3016q
Cisco Nexus 3048
Cisco Nexus 3064
Cisco Nexus 3064-32t
Cisco Nexus 3064-t
Cisco Nexus 3064-x
Cisco Nexus 3064t
Cisco Nexus 3064x
Cisco Nexus 3100
Cisco Nexus 3100-v
Cisco Nexus 3100-z
Cisco Nexus 3100v
Cisco Nexus 31108pc-v
Cisco Nexus 31108pv-v
Cisco Nexus 31108tc-v
Cisco Nexus 31128pq
Cisco Nexus 3132c-z
Cisco Nexus 3132q
Cisco Nexus 3132q-v
Cisco Nexus 3132q-x
Cisco Nexus 3132q-x\/3132q-xl
Cisco Nexus 3132q-xl
Cisco Nexus 3164q
Cisco Nexus 3172
Cisco Nexus 3172pq
Cisco Nexus 3172pq-xl
Cisco Nexus 3172pq\/pq-xl
Cisco Nexus 3172tq
Cisco Nexus 3172tq-32t
Cisco Nexus 3172tq-xl
Cisco Nexus 3200
Cisco Nexus 3232c
Cisco Nexus 3232c
Cisco Nexus 3264c-e
Cisco Nexus 3264q
Cisco Nexus 3400
Cisco Nexus 3408-s
Cisco Nexus 34180yc
Cisco Nexus 34200yc-sm
Cisco Nexus 3432d-s
Cisco Nexus 3464c
Cisco Nexus 3500
Cisco Nexus 3500 Platform
Cisco Nexus 3524
Cisco Nexus 3524-x
Cisco Nexus 3524-x\/xl
Cisco Nexus 3524-xl
Cisco Nexus 3548
Cisco Nexus 3548-x
Cisco Nexus 3548-x\/xl
Cisco Nexus 3548-xl
Cisco Nexus 3600
Cisco Nexus 36180yc-r
Cisco Nexus 3636c-r
Cisco Nexus 9000
Cisco Nexus 9000 In Aci Mode
Cisco Nexus 9000 In Standalone
Cisco Nexus 9000 In Standalone Nx-os Mode
Cisco Nexus 9000v
Cisco Nexus 9200
Cisco Nexus 92160yc-x
Cisco Nexus 9221c
Cisco Nexus 92300yc
Cisco Nexus 92304qc
Cisco Nexus 92348gc-x
Cisco Nexus 9236c
Cisco Nexus 9272q
Cisco Nexus 9300
Cisco Nexus 93108tc-ex
Cisco Nexus 93108tc-ex-24
Cisco Nexus 93108tc-fx
Cisco Nexus 93108tc-fx-24
Cisco Nexus 93108tc-fx3p
Cisco Nexus 93120tx
Cisco Nexus 93128
Cisco Nexus 93128tx
Cisco Nexus 9316d-gx
Cisco Nexus 93180lc-ex
Cisco Nexus 93180tc-ex
Cisco Nexus 93180yc-ex
Cisco Nexus 93180yc-ex-24
Cisco Nexus 93180yc-fx
Cisco Nexus 93180yc-fx-24
Cisco Nexus 93180yc-fx3
Cisco Nexus 93180yc-fx3s
Cisco Nexus 93216tc-fx2
Cisco Nexus 93240yc-fx2
Cisco Nexus 9332c
Cisco Nexus 9332pq
Cisco Nexus 93360yc-fx2
Cisco Nexus 9336c-fx2
Cisco Nexus 9336c-fx2-e
Cisco Nexus 9336pq
Cisco Nexus 9336pq Aci Spine
Cisco Nexus 9348gc-fxp
Cisco Nexus 93600cd-gx
Cisco Nexus 9364c
Cisco Nexus 9364c-gx
Cisco Nexus 9372px
Cisco Nexus 9372px-e
Cisco Nexus 9372tx
Cisco Nexus 9372tx-e
Cisco Nexus 9396px
Cisco Nexus 9396tx
Cisco Nexus 9500
Cisco Nexus 9500 Supervisor A
Cisco Nexus 9500 Supervisor A\+
Cisco Nexus 9500 Supervisor B
Cisco Nexus 9500 Supervisor B\+
Cisco Nexus 9500r
Cisco Nexus 9504
Cisco Nexus 9508
Cisco Nexus 9516
Cisco Firepower Extensible Operating System<=7.3\(8\)n1\(1\)
Cisco IOS<=7.3\(8\)n1\(1\)
Cisco IOS XE<=7.3\(8\)n1\(1\)
Cisco IOS XR<=7.3\(8\)n1\(1\)
Cisco Nx-os<=7.3\(8\)n1\(1\)
Cisco Nexus 5000
Cisco Nexus 5010
Cisco Nexus 5020
Cisco Nexus 5500
Cisco Nexus 5548p
Cisco Nexus 5548up
Cisco Nexus 5596t
Cisco Nexus 5596up
Cisco Nexus 5600
Cisco Nexus 56128p
Cisco Nexus 5624q
Cisco Nexus 5648q
Cisco Nexus 5672up
Cisco Nexus 5672up-16g
Cisco Nexus 5696q
Cisco Nexus 6000
Cisco Nexus 6001
Cisco Nexus 6001p
Cisco Nexus 6001t
Cisco Nexus 6004
Cisco Nexus 6004x
Cisco Firepower Extensible Operating System<=3.2\(3o\)a
Cisco IOS<=3.2\(3o\)a
Cisco IOS XE<=3.2\(3o\)a
Cisco IOS XR<=3.2\(3o\)a
Cisco Nx-os<=3.2\(3o\)a
Cisco UCS 6200
Cisco Ucs 6248 Up Fabric Interconnect
Cisco Ucs 6248up
Cisco Ucs 6296 Up Fabric Interconnect
Cisco Ucs 6296up
Cisco Ucs 6300
Cisco Ucs 6324
Cisco Ucs 6324 Fabric Interconnect
Cisco Ucs 6332
Cisco Ucs 6332-16up
Cisco Ucs 6332-16up Fabric Interconnect
Cisco Ucs 6332 Fabric Interconnect
Cisco Firepower Extensible Operating System<=4.1\(1a\)a
Cisco IOS<=4.1\(1a\)a
Cisco IOS XE<=4.1\(1a\)a
Cisco IOS XR<=4.1\(1a\)a
Cisco Ucs 6400
Cisco Ucs 6454

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2024 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203