CVE-2020-3161KEV · OVERDUECWE-20

Cisco IP Phones Web Server Remote Code Execution and Denial of Service Vulnerability

Critical · published April 15, 2020

Patch now

Confirmed exploited, and the score agrees

CVSS calls it critical at 9.8. It is confirmed in active exploitation. It sits in the 99.7th percentile for exploit probability.

1633
days past CISA
deadline
CVSS v3.0
9.8
EPSS
84%
Percentile
99.7
In the wild
Confirmed
What it is

🚨 A crafted HTTP request is all it takes to turn a Cisco IP Phone into a remote attack playground! 🔥 Think of it like a restaurant where the chef blindly follows any order, no questions asked — if a customer orders a dish that isn’t on the menu, chaos ensues, and the kitchen may even shut down entirely! An attacker could exploit this vulnerability to execute malicious code with root privileges, giving them full control over the device. This could lead to a complete denial of service, leaving users without phone service – absolutely devastating for any organization relying on these devices!

Put simply

Think of it like a restaurant where the chef blindly follows any order, no questions asked — if a customer orders a dish that isn’t on the menu, chaos ensues, and the kitchen may even shut down entirely! This vulnerability arises from improper input validation in the web server running on Cisco IP Phones, allowing for remote code execution through specially crafted HTTP requests.

What to do

An attacker could exploit this vulnerability to execute malicious code with root privileges, giving them full control over the device. This could lead to a complete denial of service, leaving users without phone service – absolutely devastating for any organization relying on these devices! To mitigate this, patch your Cisco IP Phones to the latest firmware version immediately, and ensure you apply any necessary security configurations. Additionally, consider restricting access to the web server to prevent unauthorized attempts. You've got this! Follow these steps and your devices will be protected in no time! 🛡️

The record
Technical detail
CVSS v3.0
9.8 · CRITICAL
Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.83855 · 99.7th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2020-04-15T20:10Z
KEV added
2021-11-03 · due 2022-05-03
EPSS history
Timeline
  • 03 NOV 00:00Z
    Added to CISA KEV — remediate by May 3
    kev
  • 15 APR 20:10Z
    Cisco IP Phones Web Server Remote Code Execution and Denial of Service Vulnerability
    cvelistv5