# CVE-2026-63117

## Summary

- **CVE ID:** CVE-2026-63117
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-369
- **Published:** Aug 19, 2026
- **Last Modified:** Aug 19, 2026

## Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, an authenticated RDP client can advertise DVI ADPCM with nBlockAlign equal to 8 and nChannels equal to 2 to make the `bs` calculation in rdpsnd_server_select_format in channels/rdpsnd/server/rdpsnd_main.c equal zero. The subsequent out_frames modulo `bs` operation raises SIGFPE and terminates the server-side rdpsnd channel process. This vulnerability fixed in 3.28.0.

## Affected Products

- FreeRDP — FreeRDP (< 3.28.0)

## References

- [CNA](https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v64m-xxfw-hrv6)
- [CNA](https://github.com/FreeRDP/FreeRDP/pull/12980)
- [CNA](https://github.com/FreeRDP/FreeRDP/commit/b78fc0b138fe8f08a8b102e193ffb32986f4449a)
- [CNA](https://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.39%
- **EPSS Percentile:** 32.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._