Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

CVE-2021-34714

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.

Published

2021-09-23T03:15:18.153

Last Modified

2024-11-21T06:11:01.790

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.4 (HIGH)

CVSSv2 Vector

AV:A/AC:M/Au:N/C:N/I:N/A:C

  • Access Vector: ADJACENT_NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: COMPLETE
Exploitability Score

5.5

Impact Score

6.9

Weaknesses
  • Type: Secondary
    CWE-20
  • Type: Primary
    CWE-20
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System cisco fxos < 2.2.2.148 Yes
Operating System cisco fxos < 2.3.1.216 Yes
Operating System cisco fxos < 2.4.1.273 Yes
Operating System cisco fxos < 2.6.1.224 Yes
Operating System cisco fxos < 2.7.1.143 Yes
Operating System cisco fxos < 2.8.1.143 Yes
Operating System cisco fxos < 2.9.1.135 Yes
Hardware cisco firepower_4100 - No
Hardware cisco firepower_4110 - No
Hardware cisco firepower_4112 - No
Hardware cisco firepower_4115 - No
Hardware cisco firepower_4120 - No
Hardware cisco firepower_4125 - No
Hardware cisco firepower_4140 - No
Hardware cisco firepower_4145 - No
Hardware cisco firepower_4150 - No
Hardware cisco firepower_9300 - No
Hardware cisco firepower_9300_sm-24 - No
Hardware cisco firepower_9300_sm-36 - No
Hardware cisco firepower_9300_sm-40 - No
Hardware cisco firepower_9300_sm-44 - No
Hardware cisco firepower_9300_sm-44_x_3 - No
Hardware cisco firepower_9300_sm-48 - No
Hardware cisco firepower_9300_sm-56 - No
Hardware cisco firepower_9300_sm-56_x_3 - No
Hardware cisco firepower_9300_with_1_sm-24_module - No
Hardware cisco firepower_9300_with_1_sm-36_module - No
Hardware cisco firepower_9300_with_1_sm-44_module - No
Hardware cisco firepower_9300_with_3_sm-44_module - No
Operating System cisco firepower_extensible_operating_system ≤ 8.4\(3.115\) Yes
Operating System cisco ios ≤ 8.4\(3.115\) Yes
Operating System cisco ios_xe ≤ 8.4\(3.115\) Yes
Operating System cisco ios_xr ≤ 8.4\(3.115\) Yes
Operating System cisco nx-os ≤ 8.4\(3.115\) Yes
Hardware cisco mds_9000 - No
Hardware cisco mds_9100 - No
Hardware cisco mds_9132t - No
Hardware cisco mds_9134 - No
Hardware cisco mds_9140 - No
Hardware cisco mds_9148 - No
Hardware cisco mds_9148s - No
Hardware cisco mds_9148t - No
Hardware cisco mds_9200 - No
Hardware cisco mds_9216 - No
Hardware cisco mds_9216a - No
Hardware cisco mds_9216i - No
Hardware cisco mds_9222i - No
Hardware cisco mds_9250i - No
Hardware cisco mds_9396s - No
Hardware cisco mds_9396t - No
Hardware cisco mds_9500 - No
Hardware cisco mds_9506 - No
Hardware cisco mds_9509 - No
Hardware cisco mds_9513 - No
Hardware cisco mds_9700 - No
Hardware cisco mds_9706 - No
Hardware cisco mds_9710 - No
Hardware cisco mds_9718 - No
Hardware cisco nexus_7000 - No
Hardware cisco nexus_7000_10-slot - No
Hardware cisco nexus_7000_18-slot - No
Hardware cisco nexus_7000_4-slot - No
Hardware cisco nexus_7000_9-slot - No
Hardware cisco nexus_7000_supervisor_1 - No
Hardware cisco nexus_7000_supervisor_2 - No
Hardware cisco nexus_7000_supervisor_2e - No
Hardware cisco nexus_7004 - No
Hardware cisco nexus_7009 - No
Hardware cisco nexus_7010 - No
Hardware cisco nexus_7018 - No
Hardware cisco nexus_7700 - No
Hardware cisco nexus_7700_10-slot - No
Hardware cisco nexus_7700_18-slot - No
Hardware cisco nexus_7700_2-slot - No
Hardware cisco nexus_7700_6-slot - No
Hardware cisco nexus_7700_supervisor_2e - No
Hardware cisco nexus_7700_supervisor_3e - No
Hardware cisco nexus_7702 - No
Hardware cisco nexus_7706 - No
Hardware cisco nexus_7710 - No
Hardware cisco nexus_7718 - No
Operating System cisco firepower_extensible_operating_system ≤ 7.0\(3\)i7\(9\) Yes
Operating System cisco ios ≤ 7.0\(3\)i7\(9\) Yes
Operating System cisco ios_xe ≤ 7.0\(3\)i7\(9\) Yes
Operating System cisco ios_xr ≤ 7.0\(3\)i7\(9\) Yes
Operating System cisco nx-os ≤ 7.0\(3\)i7\(9\) Yes
Hardware cisco nexus_3000 - No
Hardware cisco nexus_3016 - No
Hardware cisco nexus_3016q - No
Hardware cisco nexus_3048 - No
Hardware cisco nexus_3064 - No
Hardware cisco nexus_3064-32t - No
Hardware cisco nexus_3064-t - No
Hardware cisco nexus_3064-x - No
Hardware cisco nexus_3064t - No
Hardware cisco nexus_3064x - No
Hardware cisco nexus_3100 - No
Hardware cisco nexus_3100-v - No
Hardware cisco nexus_3100-z - No
Hardware cisco nexus_3100v - No
Hardware cisco nexus_31108pc-v - No
Hardware cisco nexus_31108pv-v - No
Hardware cisco nexus_31108tc-v - No
Hardware cisco nexus_31128pq - No
Hardware cisco nexus_3132c-z - No
Hardware cisco nexus_3132q - No
Hardware cisco nexus_3132q-v - No
Hardware cisco nexus_3132q-x - No
Hardware cisco nexus_3132q-x\/3132q-xl - No
Hardware cisco nexus_3132q-xl - No
Hardware cisco nexus_3164q - No
Hardware cisco nexus_3172 - No
Hardware cisco nexus_3172pq - No
Hardware cisco nexus_3172pq-xl - No
Hardware cisco nexus_3172pq\/pq-xl - No
Hardware cisco nexus_3172tq - No
Hardware cisco nexus_3172tq-32t - No
Hardware cisco nexus_3172tq-xl - No
Hardware cisco nexus_3200 - No
Hardware cisco nexus_3232c - No
Hardware cisco nexus_3232c_ - No
Hardware cisco nexus_3264c-e - No
Hardware cisco nexus_3264q - No
Hardware cisco nexus_3400 - No
Hardware cisco nexus_3408-s - No
Hardware cisco nexus_34180yc - No
Hardware cisco nexus_34200yc-sm - No
Hardware cisco nexus_3432d-s - No
Hardware cisco nexus_3464c - No
Hardware cisco nexus_3500 - No
Hardware cisco nexus_3500_platform - No
Hardware cisco nexus_3524 - No
Hardware cisco nexus_3524-x - No
Hardware cisco nexus_3524-x\/xl - No
Hardware cisco nexus_3524-xl - No
Hardware cisco nexus_3548 - No
Hardware cisco nexus_3548-x - No
Hardware cisco nexus_3548-x\/xl - No
Hardware cisco nexus_3548-xl - No
Hardware cisco nexus_3600 - No
Hardware cisco nexus_36180yc-r - No
Hardware cisco nexus_3636c-r - No
Hardware cisco nexus_9000 - No
Hardware cisco nexus_9000_in_aci_mode - No
Hardware cisco nexus_9000_in_standalone - No
Hardware cisco nexus_9000_in_standalone_nx-os_mode - No
Hardware cisco nexus_9000v - No
Hardware cisco nexus_9200 - No
Hardware cisco nexus_92160yc-x - No
Hardware cisco nexus_9221c - No
Hardware cisco nexus_92300yc - No
Hardware cisco nexus_92304qc - No
Hardware cisco nexus_92348gc-x - No
Hardware cisco nexus_9236c - No
Hardware cisco nexus_9272q - No
Hardware cisco nexus_9300 - No
Hardware cisco nexus_93108tc-ex - No
Hardware cisco nexus_93108tc-ex-24 - No
Hardware cisco nexus_93108tc-fx - No
Hardware cisco nexus_93108tc-fx-24 - No
Hardware cisco nexus_93108tc-fx3p - No
Hardware cisco nexus_93120tx - No
Hardware cisco nexus_93128 - No
Hardware cisco nexus_93128tx - No
Hardware cisco nexus_9316d-gx - No
Hardware cisco nexus_93180lc-ex - No
Hardware cisco nexus_93180tc-ex - No
Hardware cisco nexus_93180yc-ex - No
Hardware cisco nexus_93180yc-ex-24 - No
Hardware cisco nexus_93180yc-fx - No
Hardware cisco nexus_93180yc-fx-24 - No
Hardware cisco nexus_93180yc-fx3 - No
Hardware cisco nexus_93180yc-fx3s - No
Hardware cisco nexus_93216tc-fx2 - No
Hardware cisco nexus_93240yc-fx2 - No
Hardware cisco nexus_9332c - No
Hardware cisco nexus_9332pq - No
Hardware cisco nexus_93360yc-fx2 - No
Hardware cisco nexus_9336c-fx2 - No
Hardware cisco nexus_9336c-fx2-e - No
Hardware cisco nexus_9336pq - No
Hardware cisco nexus_9336pq_aci_spine - No
Hardware cisco nexus_9348gc-fxp - No
Hardware cisco nexus_93600cd-gx - No
Hardware cisco nexus_9364c - No
Hardware cisco nexus_9364c-gx - No
Hardware cisco nexus_9372px - No
Hardware cisco nexus_9372px-e - No
Hardware cisco nexus_9372tx - No
Hardware cisco nexus_9372tx-e - No
Hardware cisco nexus_9396px - No
Hardware cisco nexus_9396tx - No
Hardware cisco nexus_9500 - No
Hardware cisco nexus_9500_supervisor_a - No
Hardware cisco nexus_9500_supervisor_a\+ - No
Hardware cisco nexus_9500_supervisor_b - No
Hardware cisco nexus_9500_supervisor_b\+ - No
Hardware cisco nexus_9500r - No
Hardware cisco nexus_9504 - No
Hardware cisco nexus_9508 - No
Hardware cisco nexus_9516 - No
Operating System cisco firepower_extensible_operating_system ≤ 7.3\(8\)n1\(1\) Yes
Operating System cisco ios ≤ 7.3\(8\)n1\(1\) Yes
Operating System cisco ios_xe ≤ 7.3\(8\)n1\(1\) Yes
Operating System cisco ios_xr ≤ 7.3\(8\)n1\(1\) Yes
Operating System cisco nx-os ≤ 7.3\(8\)n1\(1\) Yes
Hardware cisco nexus_5000 - No
Hardware cisco nexus_5010 - No
Hardware cisco nexus_5020 - No
Hardware cisco nexus_5500 - No
Hardware cisco nexus_5548p - No
Hardware cisco nexus_5548up - No
Hardware cisco nexus_5596t - No
Hardware cisco nexus_5596up - No
Hardware cisco nexus_5600 - No
Hardware cisco nexus_56128p - No
Hardware cisco nexus_5624q - No
Hardware cisco nexus_5648q - No
Hardware cisco nexus_5672up - No
Hardware cisco nexus_5672up-16g - No
Hardware cisco nexus_5696q - No
Hardware cisco nexus_6000 - No
Hardware cisco nexus_6001 - No
Hardware cisco nexus_6001p - No
Hardware cisco nexus_6001t - No
Hardware cisco nexus_6004 - No
Hardware cisco nexus_6004x - No
Operating System cisco firepower_extensible_operating_system ≤ 3.2\(3o\)a Yes
Operating System cisco ios ≤ 3.2\(3o\)a Yes
Operating System cisco ios_xe ≤ 3.2\(3o\)a Yes
Operating System cisco ios_xr ≤ 3.2\(3o\)a Yes
Operating System cisco nx-os ≤ 3.2\(3o\)a Yes
Hardware cisco ucs_6200 - No
Hardware cisco ucs_6248_up_fabric_interconnect - No
Hardware cisco ucs_6248up - No
Hardware cisco ucs_6296_up_fabric_interconnect - No
Hardware cisco ucs_6296up - No
Hardware cisco ucs_6300 - No
Hardware cisco ucs_6324 - No
Hardware cisco ucs_6324_fabric_interconnect - No
Hardware cisco ucs_6332 - No
Hardware cisco ucs_6332-16up - No
Hardware cisco ucs_6332-16up_fabric_interconnect - No
Hardware cisco ucs_6332_fabric_interconnect - No
Operating System cisco firepower_extensible_operating_system ≤ 4.1\(1a\)a Yes
Operating System cisco ios ≤ 4.1\(1a\)a Yes
Operating System cisco ios_xe ≤ 4.1\(1a\)a Yes
Operating System cisco ios_xr ≤ 4.1\(1a\)a Yes
Operating System cisco nx-os ≤ 3.2\(3o\)a Yes
Hardware cisco ucs_6400 - No
Hardware cisco ucs_6454 - No
References