CVE-2026-20766

High

Published: 28 April 2026

Published

28 April 2026

Modified

28 April 2026

KEV Added

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Patch

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CVSS Score 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Score 0.0004 12.1th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-20766 is a high-severity Heap-based Buffer Overflow (CWE-122) vulnerability in Cisa (inferred from references). Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 12.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Directly mandates timely remediation of flaws like this out-of-bounds memory access vulnerability through firmware patching as recommended by the vendor.

SI-16 Memory Protection good match

prevent

Implements memory protection mechanisms such as bounds checking and address space randomization to prevent exploitation of out-of-bounds memory access vulnerabilities.

SI-10 Information Input Validation partial match

prevent

Requires validation of inputs that could trigger the out-of-bounds access, mitigating exploitation via user-interaction vectors like crafted files or links.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

Out-of-bounds access (heap buffer overflow) in network-exposed camera firmware with AV:N/PR:N enables remote exploitation of a public-facing device interface, despite UI:R requirement.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1

NVD Description

An out-of-bounds memory access vulnerability exists in specific firmware versions of Milesight AIOT cameras.

Deeper analysisAI

CVE-2026-20766 is an out-of-bounds memory access vulnerability, classified under CWE-122, present in specific firmware versions of Milesight AIOT cameras. Published on 2026-04-28, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), highlighting its high severity due to potential for significant impact across confidentiality, integrity, and availability.

The vulnerability enables exploitation over the network (AV:N) with low complexity (AC:L) and no required privileges (PR:N), though it necessitates user interaction (UI:R), such as clicking a malicious link or opening a crafted file. Attackers with network access can trigger the issue, potentially leading to high-impact consequences including unauthorized data access, modification of camera functions, or denial of service within the unchanged scope (S:U).

CISA advisory ICSA-26-113-03, documented at https://www.cisa.gov/news-events/ics-advisories/icsa-26-113-03 and in JSON format at https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-113-03.json, provides details on the flaw. Mitigation involves applying updated firmware versions available from Milesight at https://www.milesight.com/support/download/firmware.