CVE-2020-27291

Code execution via under-read in XLS parser

Published Jan 11, 2021 · Updated Aug 4, 2024

Out-of-bounds read in Delta Electronics CNCSoft-B 1.0.0.2 and earlier allows remote attackers to execute code through a crafted XLS file. Within the DOPSoft application's XLS parser, inadequate validation of user-supplied data reads before the start of an allocated data structure. Execution occurs in the current process and requires the target to visit a malicious page or open the malicious file.

CVSS severity7.8
High
EPSS probability1.90%
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 read in Delta Electronics CNCSoft-B 1.0.0.2 and earlier allows remote attackers to execute code through a crafted XLS file. Within the DOPSoft application's XLS parser, inadequate validation of user-supplied data reads before the start of an allocated data structure. Execution occurs in the current process and requires the target to visit a malicious page or open the malicious file.

The record

CVE
CVE-2020-27291
Published
Jan 11, 2021
Updated
Aug 4, 2024
Vendor
Delta Electronics, Inc.
Product
CNCSoft-B
Classifications
CWE-125, T1204.002, T1203
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

7.8Zero Day InitiativeCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NVDCVSS: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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
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.

Technologies

Your stack

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Your stack

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