CVE-2026-1951
Published: 24 April 2026
Summary
CVE-2026-1951 is a critical-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Deltaww As320T Firmware. 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 44.9th 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-10 (Information Input Validation) and SI-16 (Memory Protection).
Deeper analysis
CVE-2026-1951 is a stack-based buffer overflow vulnerability (CWE-121) affecting Delta Electronics AS320T. The issue arises from a lack of length checking for the buffer handling directory names, which can lead to overflow conditions when processing oversized inputs.
With 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), the vulnerability enables remote network-based attackers requiring no privileges or user interaction to exploit it with low complexity. Successful exploitation can result in high impacts to confidentiality, integrity, and availability, potentially allowing arbitrary code execution or system compromise.
Delta Electronics advisory PCSA-2026-00006 addresses this vulnerability along with CVE-2026-1949, 1950, and 1952 in the AS320T, providing details on mitigations; practitioners should consult the document at https://filecenter.deltaww.com/news/download/doc/Delta-PCSA-2026-00006_AS320T%20Multiple%20vulnerabilities%20(CVE-2026-1949,%201950,%201951,%201952).pdf for patching instructions and workarounds.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-25403
Vulnerability details
Delta Electronics AS320T has no checking of the length of the buffer with the directory name vulnerability.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated stack buffer overflow enables arbitrary code execution against a public-facing industrial device (T1190).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SI-10 requires validation of information inputs, directly preventing stack-based buffer overflows by enforcing length checks on directory names.
SI-2 mandates identification, reporting, and correction of system flaws like this buffer overflow vulnerability through timely patching as per the vendor advisory.
SI-16 implements memory protections such as stack canaries and DEP to prevent arbitrary code execution even if a buffer overflow occurs.