CVE-2021-34703
published 2021-09-23CVE-2021-34703: 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…
PriorityP335medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
EPSS
1.19%
64.6th percentile
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
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| cisco | cisco_ios | — | — |
| cisco | ios | <= 16.12.3 | — |
| cisco | ios_and_ios_xe | — | — |
| cisco | ios_xe | <= 16.12.3 | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvdv2.06.8MEDIUMAV:N/AC:L/Au:S/C:N/I:N/A:C
vendor_cisco6.8MEDIUM
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Cisco
Cisco IOS and IOS XE Software Link Layer Discovery Protocol Denial of Service Vulnerability
vendor_cisco·2021-09-22·CVSS 6.8
CVE-2021-34703 [MEDIUM] CWE-456 Cisco IOS and IOS XE Software Link Layer Discovery Protocol Denial of Service Vulnerability
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
Cisco
Cisco IOS and IOS XE Software Link Layer Discovery Protocol Denial of Service Vulnerability
vendor_cisco·CVSS 3.1
CVE-2021-34703 Cisco IOS and IOS XE Software Link Layer Discovery Protocol Denial of Service Vulnerability
CVE-2021-34703: 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
GHSA
GHSA-h43v-fh8q-w87r: 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
ghsa_unreviewed·2022-05-24
CVE-2021-34703 [MEDIUM] CWE-456 GHSA-h43v-fh8q-w87r: 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
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 t
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2021-09-23
Published