CVE-2020-11526Public exploitNetwork attack vector

Client crash via unchecked secondary-order length

Published May 15, 2020 · Updated Aug 4, 2024

Out-of-bounds read in FreeRDP after 1.1 through 2.0.0-rc4 allows remote authenticated users to crash the client with a crafted order. The update_recv_secondary_order parser advances the stream pointer using orderLength without verifying that the declared secondary-order span remains inside the received buffer. A malicious RDP server must supply the order during a session; the bounded reported consequence is a client crash.

CVSS severity2.2
Low
EPSS probability2.00%
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 1.1 through 2.0.0-rc4 allows remote authenticated users to crash the client with a crafted order. The update_recv_secondary_order parser advances the stream pointer using orderLength without verifying that the declared secondary-order span remains inside the received buffer. A malicious RDP server must supply the order during a session; the bounded reported consequence is a client crash.

The record

CVE
CVE-2020-11526
Published
May 15, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, CWE-125
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 15, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.2NIST NVDCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:N/A:P

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-190Integer Overflow or Wraparound
CWE-125Out-of-bounds Read

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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