CVE-2020-3111
A vulnerability in the Cisco Discovery Protocol implementation for the Cisco IP Phone could allow an unauthenticated, adjacent attacker to remotely execute code with root privileges or cause a reload of an affected IP phone.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.09%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A vulnerability in the Cisco Discovery Protocol implementation for the Cisco IP Phone could allow an unauthenticated, adjacent attacker to remotely execute code with root privileges or cause a reload of an affected IP phone. The vulnerability is due to missing checks when processing Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a crafted Cisco Discovery Protocol packet to the targeted IP phone. A successful exploit could allow the attacker to remotely execute code with root privileges or cause a reload of an affected IP phone, resulting in a denial of service (DoS) condition. Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 3.09% probability · 87th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- cisco/ip conference phone 7832 firmware · cisco/ip conference phone 7832 with multiplatform firmware · cisco/ip conference phone 8832 firmware · cisco/ip conference phone 8832 with multiplatform firmware · cisco/ip phone 6821 firmware · cisco/ip phone 6841 firmware · cisco/ip phone 6851 firmware · cisco/ip phone 6861 firmware · cisco/ip phone 6871 firmware · cisco/ip phone 7811 firmware · cisco/ip phone 7811 with multiplatform firmware · cisco/ip phone 7821 firmware · cisco/ip phone 7821 with multiplatform firmware · cisco/ip phone 7841 firmware · cisco/ip phone 7841 with multiplatform firmware · cisco/ip phone 7861 firmware · cisco/ip phone 7861 with multiplatform firmware · cisco/ip phone 8811 firmware · cisco/ip phone 8811 with multiplatform firmware · cisco/ip phone 8841 firmware · +13 more
- Source
- psirt@cisco.com
References
- http://packetstormsecurity.com/files/156203/Cisco-Discovery-Protocol-CDP-Remote-Device-Takeover.htmlThird Party Advisory, VDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-voip-phones-rce-dosVendor Advisory
- http://packetstormsecurity.com/files/156203/Cisco-Discovery-Protocol-CDP-Remote-Device-Takeover.htmlThird Party Advisory, VDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-voip-phones-rce-dosVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.