CVE-2020-11048Network attack vector

Session abort via unchecked flow-control PDU length

Published May 7, 2020 · Updated Aug 4, 2024

Out-of-bounds read in FreeRDP after 1.0 and before 2.0.0 allows remote authenticated users to abort an RDP session via a short flow-control PDU. The rdp_read_share_control_header path treats totalLength 0x8000 as flow-control data, but rdp_read_flow_control_pdu reads and seeks six bytes without checking the remaining stream length. Reaching the flaw requires high-privilege authenticated RDP access; the bounded consequence is session termination, with no data extraction.

CVSS severity2.2
Low
EPSS probability1.85%
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 after 1.0 and before 2.0.0 allows remote authenticated users to abort an RDP session via a short flow-control PDU. The rdp_read_share_control_header path treats totalLength 0x8000 as flow-control data, but rdp_read_flow_control_pdu reads and seeks six bytes without checking the remaining stream length. Reaching the flaw requires high-privilege authenticated RDP access; the bounded consequence is session termination, with no data extraction.

The record

CVE
CVE-2020-11048
Published
May 7, 2020
Updated
Aug 4, 2024
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
admin

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=> 1.0, < 2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

FreeRDP · FreeRDPversion=> 1.0, < 2.0.0

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:N/A:P
2.2GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
2.2UbuntuCVSS: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-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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