CVE-2020-27287

Code execution via malformed XLS file parsing

Published Jan 11, 2021 · Updated Aug 4, 2024

Out-of-bounds write in Delta Electronics CNCSoft-B 1.0.0.2 and earlier allows remote attackers to execute code through a crafted XLS file. The DOPSoft XLS parser does not properly validate user-supplied file data and writes past the end of an allocated buffer. Exploitation requires a user to open the malicious file or visit a page that delivers it, and the resulting code runs in the current process context.

CVSS severity7.8
High
EPSS probability2.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Delta Electronics CNCSoft-B 1.0.0.2 and earlier allows remote attackers to execute code through a crafted XLS file. The DOPSoft XLS parser does not properly validate user-supplied file data and writes past the end of an allocated buffer. Exploitation requires a user to open the malicious file or visit a page that delivers it, and the resulting code runs in the current process context.

The record

CVE
CVE-2020-27287
Published
Jan 11, 2021
Updated
Aug 4, 2024
Vendor
Delta Electronics, Inc.
Product
CNCSoft-B
Classifications
CWE-787, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=CNCSoft-B Versions 1.0.0.2 and prior

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Delta Electronics, Inc. · CNCSoft-Bversion=CNCSoft-B Versions 1.0.0.2 and prior

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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.

Technologies

Your stack

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Your stack

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