CVE-2023-20047 Denial of service in Cisco Webex Room Phone
An unauthenticated adjacent attacker can cause a denial of service on Cisco Webex Room Phones by exhausting memory via crafted LLDP traffic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-20047?
CVE-2023-20047 is a medium-severity denial of service vulnerability in Cisco Webex Room Phone, published on 19 Jan 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco Webex Room Phone and Cisco Webex Share devices could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient resource allocation. An attacker could exploit this vulnerability by sending crafted LLDP traffic to an affected device. A successful exploit could allow the attacker to exhaust the memory resources of the affected device, resulting in a crash of the LLDP process. If the affected device is configured to support LLDP only, this could cause an interruption to inbound and outbound calling. By default, these devices are configured to support both Cisco Discovery Protocol and LLDP. To recover operational state, the affected device needs a manual restart.
Which versions are affected by CVE-2023-20047?
It affects 3 products.
Products include Cisco Sip Ip Phone Software, Cisco Webex Room Phone Firmware, Cisco Webex Share Firmware.
How do I fix CVE-2023-20047?
No fix has been published for CVE-2023-20047 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-20047 being exploited?
There is no known exploitation of CVE-2023-20047 in the wild and no public exploit code.
Sources
Also known as GHSA-5f68-jm8v-355j.