Out-of-bounds write
A program writes outside the memory region it is allowed to use.
CWE-787 · CISA KEV; NVD record: ics-cert@hq.dhs.gov
Video course · Free course. C programming and memory concepts are useful; covers several weakness types.
Exploited. On CISA's list since 2022-08-25.
Delta Electronics DOPSoft 2 Improper Input Validation Vulnerability
CVE-2021-38406 · Delta Electronics DOPSoft 2 · Published 2021-09-17
How bad would it be?
7.8 out of 10
CVSS rates it high.
How likely is it to be used?
76%
Estimated chance of exploitation in the next 30 days, among the top 1% of all scored flaws (EPSS, 2026-10-29).
Is it already being used?
Yes
CISA has seen it exploited in real attacks. For US government agencies the fix is deadline passed 1506 days ago (2022-09-15).
What CISA says to do
The impacted product is end-of-life and should be disconnected if still in use.
Delta Electronics DOPSoft 2 lacks proper validation of user-supplied data when parsing specific project files (improper input validation) resulting in an out-of-bounds write that allows for code execution.
What the flaw is
Delta Electronic DOPSoft 2 (Version 2.00.07 and prior) lacks proper validation of user-supplied data when parsing specific project files. This could result in multiple out-of-bounds write instances. An attacker could leverage this vulnerability to execute code in the context of the current process.
From the NVD.
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CWE is a catalogue of weakness types. Labels come from the sources shown and can differ or change. Resource matches reviewed 16 October 2026.
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Exploited flaws from CISA's KEV catalogue. Chance of exploitation from EPSS by FIRST. Descriptions and scores from the NVD. This product uses the NVD API but is not endorsed or certified by the NVD.