CVE-2020-11043Network attack vector

Display corruption via unchecked RFX tile lengths

Published May 29, 2020 · Updated Aug 4, 2024

Out-of-bounds read in FreeRDP 2.0.0 and earlier allows remote attackers to corrupt client display output via malformed RFX data. In rfx_process_message_tileset, tile block and Y, Cb, and Cr lengths were used to advance the input stream without bounding each tile to its declared block or validating every seek. Exploitation requires a client to connect to a manipulated RDP server with RFX or GFX enabled; the documented consequence is garbage colors on screen, not memory disclosure or code execution.

CVSS severity2.2
Low
EPSS probability1.91%
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 to corrupt client display output via malformed RFX data. In rfx_process_message_tileset, tile block and Y, Cb, and Cr lengths were used to advance the input stream without bounding each tile to its declared block or validating every seek. Exploitation requires a client to connect to a manipulated RDP server with RFX or GFX enabled; the documented consequence is garbage colors on screen, not memory disclosure or code execution.

The record

CVE
CVE-2020-11043
Published
May 29, 2020
Updated
Aug 4, 2024
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-125
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

2.7UbuntuCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
2.2GitHub CNACVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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