Remote Desktop Protocol Vulnerability in FreeRDP Affects Audio Redirection
CVE-2026-33977

6.9MEDIUM

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
30 March 2026

What is CVE-2026-33977?

A vulnerability exists in FreeRDP, a widely-used implementation of the Remote Desktop Protocol. This issue allows a malicious RDP server to crash the FreeRDP client by sending invalid audio data in IMA ADPCM format. Specifically, the flaw arises from an unvalidated initial step index value, which, when indexed directly into a lookup table, results in a WINPR_ASSERT() failure and leads to a SIGABRT process termination. Notably, this vulnerability impacts any FreeRDP client that has audio redirection enabled, which is typically included in default configurations. Users are urged to update to version 3.24.2 or later to mitigate this risk.

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Affected Version(s)

FreeRDP < 3.24.2

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/9be3f03d94a5089...
x_refsource_MISC

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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