CVE-2021-38406Known exploitation

Code execution via malformed XLS file parsing

Published Sep 17, 2021 · Updated Oct 21, 2025

Out-of-bounds writes in Delta Electronics DOPSoft 2 2.00.07 and earlier allow remote attackers to execute code via crafted XLS files. The XLS parser fails to validate user-supplied data before writing it beyond the end of an allocated buffer. Execution is limited to the current process and requires the target to visit a malicious page or open a malicious file.

CVSS severity7.8
High
EPSS probability76.43%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds writes in Delta Electronics DOPSoft 2 2.00.07 and earlier allow remote attackers to execute code via crafted XLS files. The XLS parser fails to validate user-supplied data before writing it beyond the end of an allocated buffer. Execution is limited to the current process and requires the target to visit a malicious page or open a malicious file.

The record

CVE
CVE-2021-38406
Published
Sep 17, 2021
Updated
Oct 21, 2025
Vendor
Delta Electronics, Inc.
Product
DOPSoft 2
Classifications
CWE-787, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=2.00.07

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Delta Electronics, Inc. · DOPSoft 2version=unspecified <=2.00.07

Published CVSS scores

7.8CISA ICS-CERTCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002Malicious File
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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