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CVE-2026-20766— Milesight Cameras Heap-based Buffer Overflow

Quick assessment

Affected
Milesight MS-Cxx63-PD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Milesight AIOT cameras是中国星纵物联（Milesight）公司的一系列融合人工智能与物联网技术的智能监控摄像设备。 Milesight AIOT cameras存在安全漏洞，该漏洞源于越界内存访问。

CVSS 8.8 · High EPSS 0.29% · P19

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-20766

Vulnerability Information
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Vulnerability Title
Milesight Cameras Heap-based Buffer Overflow
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds memory access vulnerability exists in specific firmware versions of Milesight AIOT cameras.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Milesight AIOT cameras 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Milesight AIOT cameras是中国星纵物联（Milesight）公司的一系列融合人工智能与物联网技术的智能监控摄像设备。 Milesight AIOT cameras存在安全漏洞，该漏洞源于越界内存访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Milesight MS-Cxx63-PD 0 ~ 51.7.0.77-r12 -
Milesight MS-Cxx64-xPD 0 ~ 51.7.0.77-r12 -
Milesight MS-Cxx73-xPD 0 ~ 51.7.0.77-r12 -
Milesight MS-Cxx75-xxPD 0 ~ 51.7.0.77-r12 -
Milesight MS-Cxx83-xPD 0 ~ 51.7.0.77-r12 -
Milesight MS-Cxx74-PA 0 ~ 3x.8.0.3-r11 -
Milesight MS-C8477-HPG1 0 ~ 63.8.0.4-r3 -
Milesight MS-C8477-PC 0 ~ 48.8.0.4-r3 -
Milesight MS-C5321-FPE 0 ~ 62.8.0.4-r5 -
Milesight MS-Cxx72-xxxPE 0 ~ 61.8.0.5-r2 -
Milesight MS-Cxx62-xxxPE 0 ~ 61.8.0.5-r2 -
Milesight MS-Cxx52-xxxPE 0 ~ 61.8.0.5-r2 -
Milesight MS-Cxx66-xxxPE 0 ~ 61.8.0.5-r2 -
Milesight MS-Cxx66-xxxGPE 0 ~ 61.8.0.5-r2 -
Milesight MS-Cxx61-xxxPE 0 ~ 61.8.0.5-r2 -
Milesight MS-Cxx67-xxxPE 0 ~ 61.8.0.5-r2 -
Milesight MS-Cxx71-xxxPE 0 ~ 61.8.0.5-r2 -
Milesight MS-Cxx41-xxxPE 0 ~ 61.8.0.5-r2 -
Milesight MS-Cxx76-PE 0 ~ 61.8.0.5-r2 -
Milesight MS-Cxx65-PE 0 ~ 61.8.0.5-r2 -
Milesight MS-Cxx66-xxxG1 0 ~ 63.8.0.5-r3 -
Milesight MS-Cxx62-xxxG1 0 ~ 63.8.0.5-r3 -
Milesight MS-Cxx72-xxxG1 0 ~ 63.8.0.5-r3 -
Milesight MS-CQxx31-xxxG1 0 ~ CQ_63.8.0.5-r1 -
Milesight MS-CQxx68-xxxG1 0 ~ CQ_63.8.0.5-r1 -
Milesight MS-CQxx72-xxxG1 0 ~ CQ_63.8.0.5-r1 -
Milesight MS-Nxxxx-NxE 0 ~ 7x.9.0.19-r5 -
Milesight MS-Nxxxx-xxC 0 ~ 7x.9.0.19-r5 -
Milesight MS-Nxxxx-xxE 0 ~ 7x.9.0.19-r5 -
Milesight MS-Nxxxx-xxG 0 ~ 7x.9.0.19-r5 -

II. Public POCs for CVE-2026-20766

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III. Intelligence Information for CVE-2026-20766

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Vendor Advisories for CVE-2026-20766 (1)

Vendor Pages for CVE-2026-20766 (1)

Same Patch Batch · Milesight · 2026-04-27 · 5 CVEs total

CVE-2026-32644 9.8 CRITICAL Milesight Cameras Use of Hard-coded Cryptographic Key
CVE-2026-27785 8.8 HIGH Milesight Cameras Use of Hard-coded Credentials
CVE-2026-28747 7.1 HIGH Milesight Cameras Authorization Bypass Through User-Controlled Key
CVE-2026-32649 6.8 MEDIUM Milesight Cameras OS Command Injection

IV. Related Vulnerabilities

Same product: MS-Cxx63-PD
Same vendor: Milesight
Same weakness: CWE-122

V. Comments for CVE-2026-20766

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