CVE-2020-11046Network attack vector

Session termination via unchecked synchronize update seek

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 terminate RDP sessions. update_read_synchronize advances the input stream by two padding bytes without first verifying that those bytes remain. A malicious RDP peer must reach an established client or server session; the advisory reports session termination without data extraction.

CVSS severity2.2
Low
EPSS probability1.32%
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 terminate RDP sessions. update_read_synchronize advances the input stream by two padding bytes without first verifying that those bytes remain. A malicious RDP peer must reach an established client or server session; the advisory reports session termination without data extraction.

The record

CVE
CVE-2020-11046
Published
May 7, 2020
Updated
Aug 4, 2024
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-119, CWE-125, T1499.004
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=> 1.0, < 2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FreeRDP · FreeRDPversion=> 1.0, < 2.0.0

Published CVSS scores

3.5NVDAV:N/AC:M/Au:S/C:N/I:N/A:P
2.2NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-125Out-of-bounds Read
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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