CVE-2021-38406: in the CISA KEV catalogue
Delta Electronics DOPSoft 2 Improper Input Validation Vulnerability. CISA added CVE-2021-38406 to the Known Exploited Vulnerabilities catalogue on 2022-08-25 with a default due date of 2022-09-15. Known ransomware campaign use: Unknown. Forensic triage flag: No.
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. (CISA description)
- Vendor / product
- Delta Electronics DOPSoft 2
- CWE
- CWE-787
- CISA required action
- The impacted product is end-of-life and should be disconnected if still in use.
- EPSS
- 76%, percentile 99 (scored 2026-11-03)
EPSS puts about 76 in 100 odds (76%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2021-38406 in the CISA KEV catalogue?
Yes. CISA added CVE-2021-38406 (Delta Electronics DOPSoft 2 Improper Input Validation Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-08-25. CISA's default due date for it is 2022-09-15.
Is CVE-2021-38406 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2021-38406. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2021-38406?
CISA's required action: The impacted product is end-of-life and should be disconnected if still in use.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2021-38406