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Vulnerability Details :

CVE-2021-34703

Summary
Assigner-cisco
Assigner Org ID-d1c1063e-7a18-46af-9102-31f8928bc633
Published At-23 Sep, 2021 | 02:25
Updated At-07 Nov, 2024 | 21:59
Rejected At-
Credits

Cisco IOS and IOS XE Software Link Layer Discovery Protocol Denial of Service Vulnerability

A vulnerability in the Link Layer Discovery Protocol (LLDP) message parser of Cisco IOS Software and Cisco IOS XE Software could allow an attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to improper initialization of a buffer. An attacker could exploit this vulnerability via any of the following methods: An authenticated, remote attacker could access the LLDP neighbor table via either the CLI or SNMP while the device is in a specific state. An unauthenticated, adjacent attacker could corrupt the LLDP neighbor table by injecting specific LLDP frames into the network and then waiting for an administrator of the device or a network management system (NMS) managing the device to retrieve the LLDP neighbor table of the device via either the CLI or SNMP. An authenticated, adjacent attacker with SNMP read-only credentials or low privileges on the device CLI could corrupt the LLDP neighbor table by injecting specific LLDP frames into the network and then accessing the LLDP neighbor table via either the CLI or SNMP. A successful exploit could allow the attacker to cause the affected device to crash, resulting in a reload of the device.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:cisco
Assigner Org ID:d1c1063e-7a18-46af-9102-31f8928bc633
Published At:23 Sep, 2021 | 02:25
Updated At:07 Nov, 2024 | 21:59
Rejected At:
▼CVE Numbering Authority (CNA)
Cisco IOS and IOS XE Software Link Layer Discovery Protocol Denial of Service Vulnerability

A vulnerability in the Link Layer Discovery Protocol (LLDP) message parser of Cisco IOS Software and Cisco IOS XE Software could allow an attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to improper initialization of a buffer. An attacker could exploit this vulnerability via any of the following methods: An authenticated, remote attacker could access the LLDP neighbor table via either the CLI or SNMP while the device is in a specific state. An unauthenticated, adjacent attacker could corrupt the LLDP neighbor table by injecting specific LLDP frames into the network and then waiting for an administrator of the device or a network management system (NMS) managing the device to retrieve the LLDP neighbor table of the device via either the CLI or SNMP. An authenticated, adjacent attacker with SNMP read-only credentials or low privileges on the device CLI could corrupt the LLDP neighbor table by injecting specific LLDP frames into the network and then accessing the LLDP neighbor table via either the CLI or SNMP. A successful exploit could allow the attacker to cause the affected device to crash, resulting in a reload of the device.

Affected Products
Vendor
Cisco Systems, Inc.Cisco
Product
Cisco IOS
Versions
Affected
  • n/a
Problem Types
TypeCWE IDDescription
CWECWE-456CWE-456
Type: CWE
CWE ID: CWE-456
Description: CWE-456
Metrics
VersionBase scoreBase severityVector
3.16.8MEDIUM
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Version: 3.1
Base score: 6.8
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lldp-dos-sBnuHSjT
vendor-advisory
x_refsource_CISCO
Hyperlink: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lldp-dos-sBnuHSjT
Resource:
vendor-advisory
x_refsource_CISCO
▼Authorized Data Publishers (ADP)
1. CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lldp-dos-sBnuHSjT
vendor-advisory
x_refsource_CISCO
x_transferred
Hyperlink: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lldp-dos-sBnuHSjT
Resource:
vendor-advisory
x_refsource_CISCO
x_transferred
2. CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:ykramarz@cisco.com
Published At:23 Sep, 2021 | 03:15
Updated At:07 Nov, 2023 | 03:36

A vulnerability in the Link Layer Discovery Protocol (LLDP) message parser of Cisco IOS Software and Cisco IOS XE Software could allow an attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to improper initialization of a buffer. An attacker could exploit this vulnerability via any of the following methods: An authenticated, remote attacker could access the LLDP neighbor table via either the CLI or SNMP while the device is in a specific state. An unauthenticated, adjacent attacker could corrupt the LLDP neighbor table by injecting specific LLDP frames into the network and then waiting for an administrator of the device or a network management system (NMS) managing the device to retrieve the LLDP neighbor table of the device via either the CLI or SNMP. An authenticated, adjacent attacker with SNMP read-only credentials or low privileges on the device CLI could corrupt the LLDP neighbor table by injecting specific LLDP frames into the network and then accessing the LLDP neighbor table via either the CLI or SNMP. A successful exploit could allow the attacker to cause the affected device to crash, resulting in a reload of the device.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Secondary3.16.8MEDIUM
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Primary2.06.8MEDIUM
AV:N/AC:L/Au:S/C:N/I:N/A:C
Type: Primary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Type: Secondary
Version: 3.1
Base score: 6.8
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Type: Primary
Version: 2.0
Base score: 6.8
Base severity: MEDIUM
Vector:
AV:N/AC:L/Au:S/C:N/I:N/A:C
CPE Matches
Cisco Systems, Inc.
cisco
>>1000_integrated_services_router>>-
cpe:2.3:h:cisco:1000_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1100-4g\/6g_integrated_services_router>>-
cpe:2.3:h:cisco:1100-4g\/6g_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1100-4p_integrated_services_router>>-
cpe:2.3:h:cisco:1100-4p_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1100-8p_integrated_services_router>>-
cpe:2.3:h:cisco:1100-8p_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1100_integrated_services_router>>-
cpe:2.3:h:cisco:1100_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1101-4p_integrated_services_router>>-
cpe:2.3:h:cisco:1101-4p_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1101_integrated_services_router>>-
cpe:2.3:h:cisco:1101_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1109-2p_integrated_services_router>>-
cpe:2.3:h:cisco:1109-2p_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1109-4p_integrated_services_router>>-
cpe:2.3:h:cisco:1109-4p_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1109_integrated_services_router>>-
cpe:2.3:h:cisco:1109_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1111x-8p_integrated_services_router>>-
cpe:2.3:h:cisco:1111x-8p_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1111x_integrated_services_router>>-
cpe:2.3:h:cisco:1111x_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>111x_integrated_services_router>>-
cpe:2.3:h:cisco:111x_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1120_integrated_services_router>>-
cpe:2.3:h:cisco:1120_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>1160_integrated_services_router>>-
cpe:2.3:h:cisco:1160_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>4000_integrated_services_router>>-
cpe:2.3:h:cisco:4000_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>4221_integrated_services_router>>-
cpe:2.3:h:cisco:4221_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>4321_integrated_services_router>>-
cpe:2.3:h:cisco:4321_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>4331_integrated_services_router>>-
cpe:2.3:h:cisco:4331_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>4351_integrated_services_router>>-
cpe:2.3:h:cisco:4351_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>4431_integrated_services_router>>-
cpe:2.3:h:cisco:4431_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>4451-x_integrated_services_router>>-
cpe:2.3:h:cisco:4451-x_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>4451_integrated_services_router>>-
cpe:2.3:h:cisco:4451_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>4461_integrated_services_router>>-
cpe:2.3:h:cisco:4461_integrated_services_router:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48fd-e>>-
cpe:2.3:h:cisco:catalyst_3650-12x48fd-e:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48fd-l>>-
cpe:2.3:h:cisco:catalyst_3650-12x48fd-l:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48fd-s>>-
cpe:2.3:h:cisco:catalyst_3650-12x48fd-s:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48uq>>-
cpe:2.3:h:cisco:catalyst_3650-12x48uq:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48uq-e>>-
cpe:2.3:h:cisco:catalyst_3650-12x48uq-e:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48uq-l>>-
cpe:2.3:h:cisco:catalyst_3650-12x48uq-l:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48uq-s>>-
cpe:2.3:h:cisco:catalyst_3650-12x48uq-s:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48ur>>-
cpe:2.3:h:cisco:catalyst_3650-12x48ur:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48ur-e>>-
cpe:2.3:h:cisco:catalyst_3650-12x48ur-e:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48ur-l>>-
cpe:2.3:h:cisco:catalyst_3650-12x48ur-l:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48ur-s>>-
cpe:2.3:h:cisco:catalyst_3650-12x48ur-s:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48uz>>-
cpe:2.3:h:cisco:catalyst_3650-12x48uz:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48uz-e>>-
cpe:2.3:h:cisco:catalyst_3650-12x48uz-e:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48uz-l>>-
cpe:2.3:h:cisco:catalyst_3650-12x48uz-l:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-12x48uz-s>>-
cpe:2.3:h:cisco:catalyst_3650-12x48uz-s:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-24pd>>-
cpe:2.3:h:cisco:catalyst_3650-24pd:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-24pd-e>>-
cpe:2.3:h:cisco:catalyst_3650-24pd-e:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-24pd-l>>-
cpe:2.3:h:cisco:catalyst_3650-24pd-l:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-24pd-s>>-
cpe:2.3:h:cisco:catalyst_3650-24pd-s:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-24pdm>>-
cpe:2.3:h:cisco:catalyst_3650-24pdm:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-24pdm-e>>-
cpe:2.3:h:cisco:catalyst_3650-24pdm-e:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-24pdm-l>>-
cpe:2.3:h:cisco:catalyst_3650-24pdm-l:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-24pdm-s>>-
cpe:2.3:h:cisco:catalyst_3650-24pdm-s:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-24ps-e>>-
cpe:2.3:h:cisco:catalyst_3650-24ps-e:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-24ps-l>>-
cpe:2.3:h:cisco:catalyst_3650-24ps-l:-:*:*:*:*:*:*:*
Cisco Systems, Inc.
cisco
>>catalyst_3650-24ps-s>>-
cpe:2.3:h:cisco:catalyst_3650-24ps-s:-:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-665Primarynvd@nist.gov
CWE-456Secondaryykramarz@cisco.com
CWE ID: CWE-665
Type: Primary
Source: nvd@nist.gov
CWE ID: CWE-456
Type: Secondary
Source: ykramarz@cisco.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lldp-dos-sBnuHSjTykramarz@cisco.com
Vendor Advisory
Hyperlink: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lldp-dos-sBnuHSjT
Source: ykramarz@cisco.com
Resource:
Vendor Advisory

Change History

0
Information is not available yet

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