CVE-2022-23493Network attack vector

Memory disclosure and crash via unchecked channel identifier

Published Dec 9, 2022 · Updated Apr 23, 2025

Out-of-bounds read in xrdp before 0.9.21 allows remote attackers to disclose memory or crash the service through an RDP connection. The close-channel handler reads a 32-bit channel identifier from a channel-server message and uses it to index a 256-entry mapping without validating its range. The exposed RDP service must be network-reachable; exploitation requires no prior privileges or user interaction.

CVSS severity9.1
Critical
EPSS probability0.89%
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 xrdp before 0.9.21 allows remote attackers to disclose memory or crash the service through an RDP connection. The close-channel handler reads a 32-bit channel identifier from a channel-server message and uses it to index a 256-entry mapping without validating its range. The exposed RDP service must be network-reachable; exploitation requires no prior privileges or user interaction.

The record

CVE
CVE-2022-23493
Published
Dec 9, 2022
Updated
Apr 23, 2025
Vendor
neutrinolabs
Product
xrdp
Classifications
CWE-125, T1499.004
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

9.1GitHub, Inc.CVSS: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.

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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-125Out-of-bounds Read
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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