---
id: "CVE-2020-5735"
kind: "vulnerability"
aliases: ["CVE-2020-5735"]
title: "Amcrest Cameras and Network Video Recorder (NVR): Amcrest Cameras and NVR Stack-based Buffer Overflow Vulnerability"
severity: "high"
cvss: 8.8
epss: 0.36217
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Amcrest Cameras and Network Video Recorder (NVR)", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["amcrest", "exploited", "infrastructure", "ip-cameras", "nvr", "self-hosted"]
not_affected_if: ["no-amcrest-devices", "port-37777-not-exposed"]
published_at: "2020-04-08T13:15:13+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-5735", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2020-5735", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-5735", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Amcrest Cameras and Network Video Recorder (NVR): Amcrest Cameras and NVR Stack-based Buffer Overflow Vulnerability

Amcrest cameras and network video recorders have a stack-based buffer overflow reachable over TCP port 37777. An unauthenticated remote attacker can crash the device and possibly run code on it.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Amcrest Cameras and Network Video Recorder (NVR) affected ? fixed ?

## Fix

Apply the vendor update per Amcrest instructions; the affected and fixed firmware versions are not stated in the sources.
If no patch is available, block inbound TCP 37777 from untrusted networks.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-5735
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2020-5735
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2020-5735

## From the sources

Amcrest cameras and NVR contain a stack-based buffer overflow vulnerability through port 37777 that allows an unauthenticated, remote attacker to crash the device and possibly execute code.

CISA required action: Apply updates per vendor instructions.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_