CVE-2020-5735Known exploitationPublic exploitNetwork attack vector

Authenticated device reboot via oversized DDNS Protocol field

Published Apr 8, 2020 · Updated Oct 21, 2025

Stack-based buffer overflow in Amcrest cameras and NVR allows remote authenticated users to reboot devices via port 37777 messages. Command 0x62 subcommand 0x04 passes an oversized DDNS Protocol field to memcpy, which writes beyond a stack buffer. Valid device credentials are required; the demonstrated outcome is a reboot, while arbitrary code execution remains unverified.

CVSS severity9.0
Critical
EPSS probability36.22%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Amcrest cameras and NVR allows remote authenticated users to reboot devices via port 37777 messages. Command 0x62 subcommand 0x04 passes an oversized DDNS Protocol field to memcpy, which writes beyond a stack buffer. Valid device credentials are required; the demonstrated outcome is a reboot, while arbitrary code execution remains unverified.

The record

CVE
CVE-2020-5735
Published
Apr 8, 2020
Updated
Oct 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1211, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.0TenableAV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1211Application or System Exploitation for Defense Evasion
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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