CVE-2020-3161
Last modified
CVE-2020-3161 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 83.73% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Ip Phone 8865 Firmware | 10.3\(1\)es14 |
| Cisco | Ip Phone 8865 Firmware | 11.0\(1\) |
| Cisco | Ip Phone 8865 Firmware | 11.0\(5\)sr1 |
| Cisco | Ip Phone 8851 Firmware | 10.3\(1\)es14 |
| Cisco | Ip Phone 8851 Firmware | 11.0\(1\) |
| Cisco | Ip Phone 8851 Firmware | 11.0\(5\)sr1 |
| Cisco | Ip Phone 7841 Firmware | 11.0\(1\) |
| Cisco | Ip Phone 7821 Firmware | 11.0\(1\) |
| Cisco | Ip Phone 8811 Firmware | 10.3\(1\)es14 |
| Cisco | Ip Phone 8811 Firmware | 11.0\(1\) |
| Cisco | Ip Phone 8811 Firmware | 11.0\(5\)sr1 |
| Cisco | Ip Phone 8861 Firmware | 10.3\(1\)es14 |
| Cisco | Ip Phone 8861 Firmware | 11.0\(1\) |
| Cisco | Ip Phone 8861 Firmware | 11.0\(5\)sr1 |
| Cisco | Ip Phone 8845 Firmware | 10.3\(1\)es14 |
| Cisco | Ip Phone 8845 Firmware | 11.0\(1\) |
| Cisco | Ip Phone 8845 Firmware | 11.0\(5\)sr1 |
| Cisco | Ip Phone 7861 Firmware | 11.0\(1\) |
| Cisco | Ip Phone 8841 Firmware | 10.3\(1\)es14 |
| Cisco | Ip Phone 8841 Firmware | 11.0\(1\) |
| Cisco | Ip Phone 8841 Firmware | 11.0\(5\)sr1 |
| Cisco | Ip Phone 7811 Firmware | 11.0\(1\) |
| Cisco | Ip Phone 8821 Firmware | 10.3\(1\)es14 |
| Cisco | Ip Phone 8821 Firmware | 11.0\(1\) |
| Cisco | Ip Phone 8821 Firmware | 11.0\(5\)sr1 |
| Cisco | Ip Phone 8821-Ex Firmware | 10.3\(1\)es14 |
| Cisco | Ip Phone 8821-Ex Firmware | 11.0\(1\) |
| Cisco | Ip Phone 8821-Ex Firmware | 11.0\(5\)sr1 |
| Cisco | 8831 Firmware | 10.3\(1\)es14 |
| Cisco | 8831 Firmware | 11.0\(1\) |
| Cisco | 8831 Firmware | 11.0\(5\)sr1 |
References
- http://packetstormsecurity.com/files/157265/Cisco-IP-Phone-11.7-Denial-Of-Service.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/157265/Cisco-IP-Phone-11.7-Denial-Of-Service.htmlExploit, Third Party Advisory, VDB Entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3161US Government Resource
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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