CVE-2023-50234

Code execution via unchecked XLS buffer copy

Published May 3, 2024 · Updated Aug 2, 2024

Stack-based buffer overflow in Hancom Office Cell 11.0.0.7123 allows remote attackers to execute code through a crafted XLS file. The XLS parser copies attacker-controlled data into a stack buffer without first validating its length, allowing the copy to overwrite adjacent stack memory. Execution requires the target to visit a malicious page or open the file, and resulting code runs in the context of the current process.

CVSS severity7.8
High
EPSS probability0.34%
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 Hancom Office Cell 11.0.0.7123 allows remote attackers to execute code through a crafted XLS file. The XLS parser copies attacker-controlled data into a stack buffer without first validating its length, allowing the copy to overwrite adjacent stack memory. Execution requires the target to visit a malicious page or open the file, and resulting code runs in the context of the current process.

The record

CVE
CVE-2023-50234
Published
May 3, 2024
Updated
Aug 2, 2024
Vendor
Hancom Inc.
Product
Hancom Office
Classifications
CWE-121, CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=11.0.0.7123
  2. Affected versionversion=HancomOffice Cell 11.0.0.7123

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Hancom Inc. · Hancom Officeversion=11.0.0.7123; version=HancomOffice Cell 11.0.0.7123

Published CVSS scores

7.8NISTCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8Zero Day InitiativeCVSS:3.0/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-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
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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