Vulnerability identifier: #VU57113

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-34776

CWE-ID: CWE-125

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Cisco Small Business 220 Series Smart Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to missing length validation checks when processing LLDP messages in the Link Layer Discovery Protocol. A remote attacker on the local network can send a specially crafted LLDP packet, trigger out-of-bounds read error and cause corruption in the internal LLDP database of the affected device.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Small Business 220 Series Smart Switches: 1.2.0.6

---

External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T

---

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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