CVE-2020-3161 KEV EXPLOIT
9.8
CRITICAL · CVSS 3.1 · EPSS 83.9% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2022-05-03.
Description
A vulnerability in the web server for Cisco IP Phones could allow an unauthenticated, remote attacker to execute code with root privileges or cause a reload of an affected IP phone, resulting in a denial of service (DoS) condition. The vulnerability is due to a lack of proper input validation of HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the web server of a targeted device. 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 DoS condition.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 83.86% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-20 |
| On CISA KEV | yes — remediate by 2022-05-03 |
| Public exploit | yes |
| Published | 2020-04-15 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Cisco IP Phones Web Server Remote Code Execution and Denial-of-Service Vulnerability |
|---|---|
| Added | 2021-11-03 |
| Due | 2022-05-03 |
| Vendor / product | Cisco / Cisco IP Phones |
| Ransomware use | none reported |
Affected (26)
| Vendor | Product |
|---|---|
| cisco | 8831 |
| cisco | 8831 firmware |
| cisco | ip phone 7811 |
| cisco | ip phone 7811 firmware |
| cisco | ip phone 7821 |
| cisco | ip phone 7821 firmware |
| cisco | ip phone 7841 |
| cisco | ip phone 7841 firmware |
| cisco | ip phone 7861 |
| cisco | ip phone 7861 firmware |
| cisco | ip phone 8811 |
| cisco | ip phone 8811 firmware |
| cisco | ip phone 8821 |
| cisco | ip phone 8821 firmware |
| cisco | ip phone 8821-ex |
| cisco | ip phone 8821-ex firmware |
| cisco | ip phone 8841 |
| cisco | ip phone 8841 firmware |
| cisco | ip phone 8845 |
| cisco | ip phone 8845 firmware |
| cisco | ip phone 8851 |
| cisco | ip phone 8851 firmware |
| cisco | ip phone 8861 |
| cisco | ip phone 8861 firmware |
| cisco | ip phone 8865 |
| cisco | ip phone 8865 firmware |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Cisco IP Phone 11.7 - Denial of service (PoC) | 2020-04-17 |
References
- http://packetstormsecurity.com/files/157265/Cisco-IP-Phone-11.7-Denial-Of-Service.html
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voip-phones-rce-dos-rB6EeRXs
- http://packetstormsecurity.com/files/157265/Cisco-IP-Phone-11.7-Denial-Of-Service.html
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voip-phones-rce-dos-rB6EeRXs
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3161
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