CVE-2020-9499Network attack vector

Authenticated device crash via DDNS test command

Published Apr 9, 2020 · Updated Aug 4, 2024

Buffer overflow in the DDNS test interface of Dahua devices built before December 2019 allows remote authenticated users to crash the device. A crafted DDNS test command overruns a buffer during authenticated command processing; Dahua has not disclosed the affected function or copy operation. Administrative-level access is required, and successful exploitation interrupts device operation without reported confidentiality or integrity impact.

CVSS severity4.9
Medium
EPSS probability1.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the DDNS test interface of Dahua devices built before December 2019 allows remote authenticated users to crash the device. A crafted DDNS test command overruns a buffer during authenticated command processing; Dahua has not disclosed the affected function or copy operation. Administrative-level access is required, and successful exploitation interrupts device operation without reported confidentiality or integrity impact.

The record

CVE
CVE-2020-9499
Published
Apr 9, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 9, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.4DahuaCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
4.9DahuaCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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