CVE-2020-11049Public exploitNetwork attack vector

Service interruption via malformed share-control header

Published May 7, 2020 · Updated Aug 4, 2024

Out-of-bounds read in FreeRDP allows remote authenticated users to interrupt service via a malformed RDP share-control header. The rdp_read_share_control_header function accepts totalLength 5 with five bytes available, then consumes four bytes and reads a two-byte channelId, overreading one byte. The flaw affects clients and servers after 1.1 and before 2.0.0 on all platforms; the public trigger establishes the overread but not code execution.

CVSS severity2.2
Low
EPSS probability1.52%
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 allows remote authenticated users to interrupt service via a malformed RDP share-control header. The rdp_read_share_control_header function accepts totalLength 5 with five bytes available, then consumes four bytes and reads a two-byte channelId, overreading one byte. The flaw affects clients and servers after 1.1 and before 2.0.0 on all platforms; the public trigger establishes the overread but not code execution.

The record

CVE
CVE-2020-11049
Published
May 7, 2020
Updated
Aug 4, 2024
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-125, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 7, 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=> 1.1, < 2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FreeRDP · FreeRDPversion=> 1.1, < 2.0.0

Published CVSS scores

2.2NIST NVDCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
5.5GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

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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