Vulnerability identifier: #VU17842

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1684

CWE-ID: CWE-20

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Cisco 8800 Series IP Phones
Hardware solutions / Office equipment, IP-phones, print servers
Cisco 7800 Series IP Phones
Hardware solutions / Office equipment, IP-phones, print servers

Vendor: Cisco Systems, Inc

Description

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

The vulnerability exists in the Cisco Discovery Protocol or Link Layer Discovery Protocol (LLDP) implementation due to missing length validation of certain Cisco Discovery Protocol or LLDP packet header fields. An adjacent attacker can send a malicious Cisco Discovery Protocol or LLDP packet and cause the affected phone to reload unexpectedly, resulting in a temporary DoS condition.

Mitigation
The vulnerability has been addressed in the versions 12.6(1)MN80, 12.5(1)SR2, 12.5(1)ES1, 12.1(1)SR2.1.

Vulnerable software versions

Cisco 8800 Series IP Phones: 12.1.1

Cisco 7800 Series IP Phones: 12.1.1

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190220-cdp-lldp-dos

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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.