CVE-2022-23478Network attack vector

Unauthenticated code execution via unchecked channel identifier

Published Dec 9, 2022 · Updated Apr 23, 2025

Out-of-bounds write in xrdp's dynamic-channel handler before 0.9.21 allows remote attackers to corrupt server memory. In xrdp_mm_trans_process_drdynvc_channel_open(), an unvalidated 32-bit chansrv channel identifier indexes the fixed cs2xr_cid_map array. Unauthenticated RDP access is sufficient; successful exploitation can execute arbitrary code or interrupt the server without disclosing data.

CVSS severity9.1
Critical
EPSS probability0.80%
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 write in xrdp's dynamic-channel handler before 0.9.21 allows remote attackers to corrupt server memory. In xrdp_mm_trans_process_drdynvc_channel_open(), an unvalidated 32-bit chansrv channel identifier indexes the fixed cs2xr_cid_map array. Unauthenticated RDP access is sufficient; successful exploitation can execute arbitrary code or interrupt the server without disclosing data.

The record

CVE
CVE-2022-23478
Published
Dec 9, 2022
Updated
Apr 23, 2025
Vendor
neutrinolabs
Product
xrdp
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=< 0.9.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

neutrinolabs · xrdpversion=< 0.9.21

Published CVSS scores

9.1neutrinolabsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

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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