CVE-2023-40250Network attack vector

Memory corruption via unchecked buffer copy

Published Jan 12, 2024 · Updated Nov 14, 2024

Classic buffer overflow in Hancom HCell 12.0.0.893 allows remote attackers to corrupt memory through crafted input on Windows. The published record says an input buffer is copied without a size check but does not identify the parser, function, data format, or destination buffer. Exploitation requires user interaction; the public record does not specify whether the resulting overflow crashes HCell or enables code execution.

CVSS severity8.8
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Classic buffer overflow in Hancom HCell 12.0.0.893 allows remote attackers to corrupt memory through crafted input on Windows. The published record says an input buffer is copied without a size check but does not identify the parser, function, data format, or destination buffer. Exploitation requires user interaction; the public record does not specify whether the resulting overflow crashes HCell or enables code execution.

The record

CVE
CVE-2023-40250
Published
Jan 12, 2024
Updated
Nov 14, 2024
Vendor
Hancom Inc.
Product
Hancom Office HCell
Classifications
CWE-120, CAPEC-100, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 14, 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=12.0.0.893

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hancom Inc. · Hancom Office HCellversion=12.0.0.893

Published CVSS scores

8.8KrCERT/CCCVSS:3.1/AV:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CAPEC-100Overflow Buffers
T1204User 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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