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nvd[email protected]NVD:CVE-2021-34703
HistorySep 23, 2021 - 3:15 a.m.

CVE-2021-34703

2021-09-2303:15:16
CWE-665
CWE-456
web.nvd.nist.gov
4
vulnerability
lldp
cisco ios
dos
snmp
buffer initialization
denial of service

CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:L/Au:S/C:N/I:N/A:C

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.001

Percentile

44.2%

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 configurations

Nvd
Node
cisco1000_integrated_services_routerMatch-
OR
cisco1100-4g\/6g_integrated_services_routerMatch-
OR
cisco1100-4p_integrated_services_routerMatch-
OR
cisco1100-8p_integrated_services_routerMatch-
OR
cisco1100_integrated_services_routerMatch-
OR
cisco1101-4p_integrated_services_routerMatch-
OR
cisco1101_integrated_services_routerMatch-
OR
cisco1109-2p_integrated_services_routerMatch-
OR
cisco1109-4p_integrated_services_routerMatch-
OR
cisco1109_integrated_services_routerMatch-
OR
cisco1111x-8p_integrated_services_routerMatch-
OR
cisco1111x_integrated_services_routerMatch-
OR
cisco111x_integrated_services_routerMatch-
OR
cisco1120_integrated_services_routerMatch-
OR
cisco1160_integrated_services_routerMatch-
OR
cisco4000_integrated_services_routerMatch-
OR
cisco4221_integrated_services_routerMatch-
OR
cisco4321_integrated_services_routerMatch-
OR
cisco4331_integrated_services_routerMatch-
OR
cisco4351_integrated_services_routerMatch-
OR
cisco4431_integrated_services_routerMatch-
OR
cisco4451-x_integrated_services_routerMatch-
OR
cisco4451_integrated_services_routerMatch-
OR
cisco4461_integrated_services_routerMatch-
OR
ciscocatalyst_3650-12x48fd-eMatch-
OR
ciscocatalyst_3650-12x48fd-lMatch-
OR
ciscocatalyst_3650-12x48fd-sMatch-
OR
ciscocatalyst_3650-12x48uqMatch-
OR
ciscocatalyst_3650-12x48uq-eMatch-
OR
ciscocatalyst_3650-12x48uq-lMatch-
OR
ciscocatalyst_3650-12x48uq-sMatch-
OR
ciscocatalyst_3650-12x48urMatch-
OR
ciscocatalyst_3650-12x48ur-eMatch-
OR
ciscocatalyst_3650-12x48ur-lMatch-
OR
ciscocatalyst_3650-12x48ur-sMatch-
OR
ciscocatalyst_3650-12x48uzMatch-
OR
ciscocatalyst_3650-12x48uz-eMatch-
OR
ciscocatalyst_3650-12x48uz-lMatch-
OR
ciscocatalyst_3650-12x48uz-sMatch-
OR
ciscocatalyst_3650-24pdMatch-
OR
ciscocatalyst_3650-24pd-eMatch-
OR
ciscocatalyst_3650-24pd-lMatch-
OR
ciscocatalyst_3650-24pd-sMatch-
OR
ciscocatalyst_3650-24pdmMatch-
OR
ciscocatalyst_3650-24pdm-eMatch-
OR
ciscocatalyst_3650-24pdm-lMatch-
OR
ciscocatalyst_3650-24pdm-sMatch-
OR
ciscocatalyst_3650-24ps-eMatch-
OR
ciscocatalyst_3650-24ps-lMatch-
OR
ciscocatalyst_3650-24ps-sMatch-
OR
ciscocatalyst_3650-24td-eMatch-
OR
ciscocatalyst_3650-24td-lMatch-
OR
ciscocatalyst_3650-24td-sMatch-
OR
ciscocatalyst_3650-24ts-eMatch-
OR
ciscocatalyst_3650-24ts-lMatch-
OR
ciscocatalyst_3650-24ts-sMatch-
OR
ciscocatalyst_3650-48fd-eMatch-
OR
ciscocatalyst_3650-48fd-lMatch-
OR
ciscocatalyst_3650-48fd-sMatch-
OR
ciscocatalyst_3650-48fqMatch-
OR
ciscocatalyst_3650-48fq-eMatch-
OR
ciscocatalyst_3650-48fq-lMatch-
OR
ciscocatalyst_3650-48fq-sMatch-
OR
ciscocatalyst_3650-48fqmMatch-
OR
ciscocatalyst_3650-48fqm-eMatch-
OR
ciscocatalyst_3650-48fqm-lMatch-
OR
ciscocatalyst_3650-48fqm-sMatch-
OR
ciscocatalyst_3650-48fs-eMatch-
OR
ciscocatalyst_3650-48fs-lMatch-
OR
ciscocatalyst_3650-48fs-sMatch-
OR
ciscocatalyst_3650-48pd-eMatch-
OR
ciscocatalyst_3650-48pd-lMatch-
OR
ciscocatalyst_3650-48pd-sMatch-
OR
ciscocatalyst_3650-48pq-eMatch-
OR
ciscocatalyst_3650-48pq-lMatch-
OR
ciscocatalyst_3650-48pq-sMatch-
OR
ciscocatalyst_3650-48ps-eMatch-
OR
ciscocatalyst_3650-48ps-lMatch-
OR
ciscocatalyst_3650-48ps-sMatch-
OR
ciscocatalyst_3650-48td-eMatch-
OR
ciscocatalyst_3650-48td-lMatch-
OR
ciscocatalyst_3650-48td-sMatch-
OR
ciscocatalyst_3650-48tq-eMatch-
OR
ciscocatalyst_3650-48tq-lMatch-
OR
ciscocatalyst_3650-48tq-sMatch-
OR
ciscocatalyst_3650-48ts-eMatch-
OR
ciscocatalyst_3650-48ts-lMatch-
OR
ciscocatalyst_3650-48ts-sMatch-
OR
ciscocatalyst_3650-8x24pd-eMatch-
OR
ciscocatalyst_3650-8x24pd-lMatch-
OR
ciscocatalyst_3650-8x24pd-sMatch-
OR
ciscocatalyst_3650-8x24uqMatch-
OR
ciscocatalyst_3650-8x24uq-eMatch-
OR
ciscocatalyst_3650-8x24uq-lMatch-
OR
ciscocatalyst_3650-8x24uq-sMatch-
OR
ciscocatalyst_3850Match-
OR
ciscocatalyst_3850-12s-eMatch-
OR
ciscocatalyst_3850-12s-sMatch-
OR
ciscocatalyst_3850-12x48uMatch-
OR
ciscocatalyst_3850-12xs-eMatch-
OR
ciscocatalyst_3850-12xs-sMatch-
OR
ciscocatalyst_3850-16xs-eMatch-
OR
ciscocatalyst_3850-16xs-sMatch-
OR
ciscocatalyst_3850-24p-eMatch-
OR
ciscocatalyst_3850-24p-lMatch-
OR
ciscocatalyst_3850-24p-sMatch-
OR
ciscocatalyst_3850-24pw-sMatch-
OR
ciscocatalyst_3850-24s-eMatch-
OR
ciscocatalyst_3850-24s-sMatch-
OR
ciscocatalyst_3850-24t-eMatch-
OR
ciscocatalyst_3850-24t-lMatch-
OR
ciscocatalyst_3850-24t-sMatch-
OR
ciscocatalyst_3850-24uMatch-
OR
ciscocatalyst_3850-24u-eMatch-
OR
ciscocatalyst_3850-24u-lMatch-
OR
ciscocatalyst_3850-24u-sMatch-
OR
ciscocatalyst_3850-24xsMatch-
OR
ciscocatalyst_3850-24xs-eMatch-
OR
ciscocatalyst_3850-24xs-sMatch-
OR
ciscocatalyst_3850-24xuMatch-
OR
ciscocatalyst_3850-24xu-eMatch-
OR
ciscocatalyst_3850-24xu-lMatch-
OR
ciscocatalyst_3850-24xu-sMatch-
OR
ciscocatalyst_3850-32xs-eMatch-
OR
ciscocatalyst_3850-32xs-sMatch-
OR
ciscocatalyst_3850-48f-eMatch-
OR
ciscocatalyst_3850-48f-lMatch-
OR
ciscocatalyst_3850-48f-sMatch-
OR
ciscocatalyst_3850-48p-eMatch-
OR
ciscocatalyst_3850-48p-lMatch-
OR
ciscocatalyst_3850-48p-sMatch-
OR
ciscocatalyst_3850-48pw-sMatch-
OR
ciscocatalyst_3850-48t-eMatch-
OR
ciscocatalyst_3850-48t-lMatch-
OR
ciscocatalyst_3850-48t-sMatch-
OR
ciscocatalyst_3850-48uMatch-
OR
ciscocatalyst_3850-48u-eMatch-
OR
ciscocatalyst_3850-48u-lMatch-
OR
ciscocatalyst_3850-48u-sMatch-
OR
ciscocatalyst_3850-48xsMatch-
OR
ciscocatalyst_3850-48xs-eMatch-
OR
ciscocatalyst_3850-48xs-f-eMatch-
OR
ciscocatalyst_3850-48xs-f-sMatch-
OR
ciscocatalyst_3850-48xs-sMatch-
OR
ciscocatalyst_3850-nm-2-40gMatch-
OR
ciscocatalyst_3850-nm-8-10gMatch-
OR
ciscocatalyst_9200Match-
OR
ciscocatalyst_9300Match-
OR
ciscocatalyst_9300-24p-aMatch-
OR
ciscocatalyst_9300-24p-eMatch-
OR
ciscocatalyst_9300-24s-aMatch-
OR
ciscocatalyst_9300-24s-eMatch-
OR
ciscocatalyst_9300-24t-aMatch-
OR
ciscocatalyst_9300-24t-eMatch-
OR
ciscocatalyst_9300-24u-aMatch-
OR
ciscocatalyst_9300-24u-eMatch-
OR
ciscocatalyst_9300-24ux-aMatch-
OR
ciscocatalyst_9300-24ux-eMatch-
OR
ciscocatalyst_9300-48p-aMatch-
OR
ciscocatalyst_9300-48p-eMatch-
OR
ciscocatalyst_9300-48s-aMatch-
OR
ciscocatalyst_9300-48s-eMatch-
OR
ciscocatalyst_9300-48t-aMatch-
OR
ciscocatalyst_9300-48t-eMatch-
OR
ciscocatalyst_9300-48u-aMatch-
OR
ciscocatalyst_9300-48u-eMatch-
OR
ciscocatalyst_9300-48un-aMatch-
OR
ciscocatalyst_9300-48un-eMatch-
OR
ciscocatalyst_9300-48uxm-aMatch-
OR
ciscocatalyst_9300-48uxm-eMatch-
OR
ciscocatalyst_9300lMatch-
OR
ciscocatalyst_9300l-24p-4g-aMatch-
OR
ciscocatalyst_9300l-24p-4g-eMatch-
OR
ciscocatalyst_9300l-24p-4x-aMatch-
OR
ciscocatalyst_9300l-24p-4x-eMatch-
OR
ciscocatalyst_9300l-24t-4g-aMatch-
OR
ciscocatalyst_9300l-24t-4g-eMatch-
OR
ciscocatalyst_9300l-24t-4x-aMatch-
OR
ciscocatalyst_9300l-24t-4x-eMatch-
OR
ciscocatalyst_9300l-48p-4g-aMatch-
OR
ciscocatalyst_9300l-48p-4g-eMatch-
OR
ciscocatalyst_9300l-48p-4x-aMatch-
OR
ciscocatalyst_9300l-48p-4x-eMatch-
OR
ciscocatalyst_9300l-48t-4g-aMatch-
OR
ciscocatalyst_9300l-48t-4g-eMatch-
OR
ciscocatalyst_9300l-48t-4x-aMatch-
OR
ciscocatalyst_9300l-48t-4x-eMatch-
OR
ciscocatalyst_9300l_stackMatch-
OR
ciscocatalyst_9400Match-
OR
ciscocatalyst_9407rMatch-
OR
ciscocatalyst_9410rMatch-
OR
ciscocatalyst_9500Match-
OR
ciscocatalyst_9600Match-
OR
ciscocatalyst_9800Match-
OR
ciscocatalyst_9800-40Match-
OR
ciscocatalyst_9800-80Match-
OR
ciscocatalyst_9800-clMatch-
OR
ciscocatalyst_9800-lMatch-
OR
ciscocatalyst_9800-l-cMatch-
OR
ciscocatalyst_9800-l-fMatch-
OR
ciscocsr_1000vMatch-
AND
ciscoiosRange≤16.12.3
OR
ciscoios_xeRange≤16.12.3
VendorProductVersionCPE
cisco1000_integrated_services_router-cpe:2.3:h:cisco:1000_integrated_services_router:-:*:*:*:*:*:*:*
cisco1100-4g\/6g_integrated_services_router-cpe:2.3:h:cisco:1100-4g\/6g_integrated_services_router:-:*:*:*:*:*:*:*
cisco1100-4p_integrated_services_router-cpe:2.3:h:cisco:1100-4p_integrated_services_router:-:*:*:*:*:*:*:*
cisco1100-8p_integrated_services_router-cpe:2.3:h:cisco:1100-8p_integrated_services_router:-:*:*:*:*:*:*:*
cisco1100_integrated_services_router-cpe:2.3:h:cisco:1100_integrated_services_router:-:*:*:*:*:*:*:*
cisco1101-4p_integrated_services_router-cpe:2.3:h:cisco:1101-4p_integrated_services_router:-:*:*:*:*:*:*:*
cisco1101_integrated_services_router-cpe:2.3:h:cisco:1101_integrated_services_router:-:*:*:*:*:*:*:*
cisco1109-2p_integrated_services_router-cpe:2.3:h:cisco:1109-2p_integrated_services_router:-:*:*:*:*:*:*:*
cisco1109-4p_integrated_services_router-cpe:2.3:h:cisco:1109-4p_integrated_services_router:-:*:*:*:*:*:*:*
cisco1109_integrated_services_router-cpe:2.3:h:cisco:1109_integrated_services_router:-:*:*:*:*:*:*:*
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CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:L/Au:S/C:N/I:N/A:C

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.001

Percentile

44.2%

Related for NVD:CVE-2021-34703