CVE-2020-11017Network attack vector

Server crash via zero-length clipboard capability

Published May 29, 2020 · Updated Aug 4, 2024

Double free in FreeRDP 2.0.0 and earlier allows remote authenticated users to crash servers through crafted clipboard capabilities. cliprdr_server_receive_capabilities uses a client-controlled zero capabilitySetLength as realloc's size, then frees the same allocation again when realloc returns NULL. Reachability requires an established client session and enabled server clipboard support; successful exploitation terminates the server process.

CVSS severity6.5
Medium
EPSS probability1.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in FreeRDP 2.0.0 and earlier allows remote authenticated users to crash servers through crafted clipboard capabilities. cliprdr_server_receive_capabilities uses a client-controlled zero capabilitySetLength as realloc's size, then frees the same allocation again when realloc returns NULL. Reachability requires an established client session and enabled server clipboard support; successful exploitation terminates the server process.

The record

CVE
CVE-2020-11017
Published
May 29, 2020
Updated
Aug 4, 2024
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-415, T1499.004
Attack vector
network
Privileges
authenticated

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 privilegesauthenticated

What is affected?

FreeRDP · FreeRDPversion=<= 2.0.0

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0NIST NVDAV:N/AC:L/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.

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-415Double Free
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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