CVE-2023-39351Public exploitNetwork attack vector

Client crash via stale uninitialized RemoteFX tiles

Published Aug 31, 2023 · Updated Nov 3, 2025

NULL pointer dereference in FreeRDP clients before 2.11.0 and 3.0.0-beta1 through 3.0.0-beta2 allows remote attackers to crash the client. A failed rfx_allocate_tiles initialization leaves null tile entries in context->currentMessage, which later successful processing dereferences. Exposure requires a client connection to an RDP server that sends an invalid RemoteFX tileset followed by a valid message; impact is limited to process termination.

CVSS severity5.3
Medium
EPSS probability1.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in FreeRDP clients before 2.11.0 and 3.0.0-beta1 through 3.0.0-beta2 allows remote attackers to crash the client. A failed rfx_allocate_tiles initialization leaves null tile entries in context->currentMessage, which later successful processing dereferences. Exposure requires a client connection to an RDP server that sends an invalid RemoteFX tileset followed by a valid message; impact is limited to process termination.

The record

CVE
CVE-2023-39351
Published
Aug 31, 2023
Updated
Nov 3, 2025
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2023CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.11.0
  2. Affected versionversion=>= 3.0.0-beta1, < 3.0.0-beta3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeRDP · FreeRDPversion=< 2.11.0; version=>= 3.0.0-beta1, < 3.0.0-beta3

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/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.

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 exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation Flood

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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