CVE-2026-1952

Critical

Published: 24 April 2026

Published

24 April 2026

Modified

24 April 2026

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0005 17.0th percentile

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

Summary

CVE-2026-1952 is a critical-severity Hidden Functionality (CWE-912) vulnerability in Deltaww (inferred from references). Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 17.0th 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 CM-7 (Least Functionality) and SC-5 (Denial-of-service Protection).

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 requires identification, reporting, and correction of the flaw in CVE-2026-1952 via patching as per Delta advisory PCSA-2026-00006.

SC-5 Denial-of-service Protection good match

prevent

Implements mechanisms to protect against or limit effects of denial-of-service attacks exploiting the undocumented subfunction.

CM-7 Least Functionality good match

prevent

Restricts the AS320T to least functionality necessary, eliminating or disabling hidden undocumented subfunctions per CWE-912.

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?

Remote unauthenticated exploitation of hidden functionality in a network-exposed industrial device directly maps to exploitation of public-facing applications.

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

NVD Description

Delta Electronics AS320T has denial of service via the undocumented subfunction vulnerability.

Deeper analysisAI

CVE-2026-1952 is a vulnerability in Delta Electronics AS320T that enables denial of service through an undocumented subfunction. This issue is classified under CWE-912 (Hidden Functionality) and carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating critical severity with high impacts across confidentiality, integrity, and availability.

An unauthenticated attacker with network access can exploit this vulnerability due to its low attack complexity and lack of required privileges or user interaction. Exploitation grants high-level disruption, potentially compromising data confidentiality, system integrity, and availability on the affected device.

Delta Electronics has issued advisory PCSA-2026-00006, which covers multiple vulnerabilities in AS320T including CVE-2026-1949, CVE-2026-1950, CVE-2026-1951, and CVE-2026-1952. The advisory PDF is available at https://filecenter.deltaww.com/news/download/doc/Delta-PCSA-2026-00006_AS320T%20Multiple%20vulnerabilities%20(CVE-2026-1949,%201950,%201951,%201952).pdf.