CVE-2020-10639

Code execution via wKPFString stack buffer overflow

Published Apr 15, 2020 · Updated Aug 4, 2024

Stack-based buffer overflow in Eaton HMiSoft VU3 3.00.23 and earlier allows remote attackers to execute code via a crafted VU3 file. The VU3-file wKPFString parser copies user-supplied data into a fixed-length stack buffer without validating its length. Exploitation requires a target to open the malicious file or visit a malicious page; it executes code in or crashes the current process.

CVSS severity7.8
High
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Eaton HMiSoft VU3 3.00.23 and earlier allows remote attackers to execute code via a crafted VU3 file. The VU3-file wKPFString parser copies user-supplied data into a fixed-length stack buffer without validating its length. Exploitation requires a target to open the malicious file or visit a malicious page; it executes code in or crashes the current process.

The record

CVE
CVE-2020-10639
Published
Apr 15, 2020
Updated
Aug 4, 2024
Vendor
Eaton
Product
HMiSoft VU3
Classifications
CWE-120, CWE-121, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2020CVE 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=HMiSoft VU3 Version 3.00.23 and prior, however, the HMIVU runtimes are not impacted by these issues.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Eaton · HMiSoft VU3version=HMiSoft VU3 Version 3.00.23 and prior, however, the HMIVU runtimes are not impacted by these issues.

Published CVSS scores

7.8EatonCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-121Stack-based Buffer Overflow
T1203Exploitation for Client Execution
T1204.002User Execution: Malicious 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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