CVE-2020-5735KEV · OVERDUECWE-121

Amcrest Cameras and NVR Stack-based Buffer Overflow Vulnerability

High · published April 8, 2020

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.8. It is confirmed in active exploitation. It sits in the 98.5th percentile for exploit probability.

1634
days past CISA
deadline
CVSS v3.1
8.8
EPSS
36%
Percentile
98.5
In the wild
Confirmed
What it is

🚨 A stack-based buffer overflow on Amcrest cameras and NVRs is a serious threat! An authenticated attacker can exploit this vulnerability over port 37777 to crash devices or even execute arbitrary code. 🔥 Think of it like a delivery person who can shove more packages into a mailbox than it was designed to hold — eventually, the mailbox bursts, spilling all its contents and causing chaos. In this case, the camera or NVR crashes, leaving your security system vulnerable. An attacker seizing this opportunity could take full control of your camera system, leading to unauthorized access to video feeds, device crashes, and even potential breaches into your network. It’s not just a simple inconvenience; it can compromise your entire security setup! ⚡

Put simply

Think of it like a delivery person who can shove more packages into a mailbox than it was designed to hold — eventually, the mailbox bursts, spilling all its contents and causing chaos. In this case, the camera or NVR crashes, leaving your security system vulnerable. The vulnerability lies in the handling of data over port 37777, allowing an authenticated remote attacker to manipulate stack memory, resulting in a buffer overflow that could execute arbitrary code.

What to do

An attacker seizing this opportunity could take full control of your camera system, leading to unauthorized access to video feeds, device crashes, and even potential breaches into your network. It’s not just a simple inconvenience; it can compromise your entire security setup! ⚡ To safeguard your devices, patch immediately to the latest firmware provided by Amcrest. Ensure that all network settings are configured properly, and limit access to trusted users only. Regularly monitor your system for any suspicious activity. You've got this! By taking these steps, you’ll fortify your devices and keep those cyber baddies at bay! 🛡️

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.36217 · 98.5th percentile
Weakness
CWE-121 · Stack-based Buffer Overflow
Published
2020-04-08T12:42Z
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
  • 08 APR 12:42Z
    Amcrest cameras and NVR are vulnerable to a stack-based buffer overflow over port 37777
    cvelistv5