Vulnerability identifier: #VU56864

Vulnerability risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-34703

CWE-ID: CWE-456

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Cisco IOS
Operating systems & Components / Operating system
Cisco IOS XE
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper initialization of a buffer in the Link Layer Discovery Protocol (LLDP) message parser. A remote authenticated attacker on the local network can trigger a reload of an affected device and cause a denial of service condition on the target system 

Mitigation
Install update from vendor's website.

Vulnerable software versions

Cisco IOS: 16.12.3

Cisco IOS XE: 16.12.3

---

External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lldp-dos-sBnuHSjT

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.