CVE-2022-39318Network attack vector

Client crash via zero USB packet count

Published Nov 16, 2022 · Updated Nov 3, 2025

Denial of service in FreeRDP before 2.9.0 allows remote attackers controlling an RDP server to crash a client through USB redirection. The urbdrc client's libusb_udev_isoch_transfer function divides BufferSize by a server-supplied NumberOfPackets without first rejecting zero. The client must connect to the malicious server with /usb redirection enabled; the demonstrated consequence is a client process crash.

CVSS severity4.8
Medium
EPSS probability1.04%
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 before 2.9.0 allows remote attackers controlling an RDP server to crash a client through USB redirection. The urbdrc client's libusb_udev_isoch_transfer function divides BufferSize by a server-supplied NumberOfPackets without first rejecting zero. The client must connect to the malicious server with /usb redirection enabled; the demonstrated consequence is a client process crash.

The record

CVE
CVE-2022-39318
Published
Nov 16, 2022
Updated
Nov 3, 2025
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-20, CWE-369, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 16, 2022CVE 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=< 2.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FreeRDP · FreeRDPversion=< 2.9.0

Published CVSS scores

5.7NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
4.8GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:R/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-369Divide By Zero
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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