CVE-2024-32660Network attack vector

Client crash via unbounded ZGFX allocation

Published Apr 23, 2024 · Updated Nov 3, 2025

Denial of service in FreeRDP 2.x before 2.11.7 and 3.x before 3.5.1 allows remote attackers to crash clients through a malicious RDP server. The zgfx_decompress multipart path trusts the server-supplied uncompressedSize field and allocates the entire claimed output buffer before decoding segments. A client must connect to an attacker-controlled server and process a segmented ZGFX message; the resulting oversized allocation exhausts memory and terminates the client.

CVSS severity7.5
High
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in FreeRDP 2.x before 2.11.7 and 3.x before 3.5.1 allows remote attackers to crash clients through a malicious RDP server. The zgfx_decompress multipart path trusts the server-supplied uncompressedSize field and allocates the entire claimed output buffer before decoding segments. A client must connect to an attacker-controlled server and process a segmented ZGFX message; the resulting oversized allocation exhausts memory and terminates the client.

The record

CVE
CVE-2024-32660
Published
Apr 23, 2024
Updated
Nov 3, 2025
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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=0 <=3.5.1
  2. Affected versionversion=< 3.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeRDP · FreeRDPversion=0 <=3.5.1; version=< 3.5.1

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
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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