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.
This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.4, indicating it requires adjacent network access with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 225 products from cisco, from cisco, from cisco and 222 others, organizations running these solutions should prioritize assessment and patching.
Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.
2021-09-23T03:15:18.153
2024-11-21T06:11:01.790
Modified
CVSSv3.1: 7.4 (HIGH)
AV:A/AC:M/Au:N/C:N/I:N/A:C
5.5
6.9
| 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 |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.