CVE-2020-11041Network attack vector

Client crash via unchecked sound format index

Published May 29, 2020 · Updated Aug 4, 2024

Out-of-bounds read in FreeRDP 2.0.0 and earlier allows remote attackers controlling an RDP server to crash sound-enabled clients. The rdpsnd_recv_wave2_pdu function reads wFormatNo from a server-supplied sound PDU and indexes ClientFormats without checking its bounds. An attacker must control the RDP server data received by a sound-enabled client; impact is limited to client crash, distorted audio, or session disconnect.

CVSS severity2.2
Low
EPSS probability1.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in FreeRDP 2.0.0 and earlier allows remote attackers controlling an RDP server to crash sound-enabled clients. The rdpsnd_recv_wave2_pdu function reads wFormatNo from a server-supplied sound PDU and indexes ClientFormats without checking its bounds. An attacker must control the RDP server data received by a sound-enabled client; impact is limited to client crash, distorted audio, or session disconnect.

The record

CVE
CVE-2020-11041
Published
May 29, 2020
Updated
Aug 4, 2024
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-129, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 29, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

FreeRDP · FreeRDPversion=<= 2.0.0

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:N/A:P
2.7NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
2.2GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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