CVE-2026-22859Public exploitNetwork attack vector

Client crash via unchecked USB interface indices

Published Jan 14, 2026 · Updated Jan 14, 2026

Out-of-bounds read in FreeRDP before 3.20.1 allows remote attackers to crash URBDRC clients through a malicious RDP server. libusb_udev_complete_msconfig_setup uses unchecked InterfaceNumber and AlternateSetting fields from TS_URB_SELECT_CONFIGURATION as array indices. USB redirection must be enabled and the client must connect to the attacker-controlled server; the demonstrated consequence is a client crash, while heap corruption creates additional code-execution risk.

CVSS severity9.1
Critical
EPSS probability0.87%
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 before 3.20.1 allows remote attackers to crash URBDRC clients through a malicious RDP server. libusb_udev_complete_msconfig_setup uses unchecked InterfaceNumber and AlternateSetting fields from TS_URB_SELECT_CONFIGURATION as array indices. USB redirection must be enabled and the client must connect to the attacker-controlled server; the demonstrated consequence is a client crash, while heap corruption creates additional code-execution risk.

The record

CVE
CVE-2026-22859
Published
Jan 14, 2026
Updated
Jan 14, 2026
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-125, CWE-129, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 2026Record 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=< 3.20.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeRDP · FreeRDPversion=< 3.20.1

Published CVSS scores

5.6GitHubCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:P
9.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-129Improper Validation of Array Index
T1203Exploitation for Client Execution

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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