Debian LinuxOperating system · Debian
CVE-2022-23493
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedxrdp is an open source project which provides a graphical login to remote machines using Microsoft Remote Desktop Protocol (RDP). xrdp < v0.9.21 contain a Out of Bound Read in xrdp_mm_trans_process_drdynvc_channel_close() function. There are no known workarounds for this issue. Users are advised to upgrade.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidencexrdp versions prior to 0.9.21 contain an out-of-bounds read vulnerability in the xrdp_mm_trans_process_drdynvc_channel_close() function. This memory safety flaw could allow an attacker to read sensitive memory contents or cause a denial of service. The vulnerability is in the dynamic virtual channel (drdynvc) processing code used for RDP communications.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
Debian LinuxOperating system
= 11.0< 0.9.21CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Determine installed xrdp versionRun 'xrdp --version' or check the package manager (e.g., 'dpkg -l xrdp' on Debian, 'rpm -qi xrdp' on RHEL-based systems)Affected if The version shown is less than 0.9.21 or the version cannot be determined (indicating an older release)
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Identify if drdynvc module is loaded or configuredExamine xrdp configuration files (typically /etc/xrdp/xrdp.ini or /etc/xrdp/startwm.sh) for references to drdynvc or dynamic virtual channel settingsAffected if drdynvc or dynamic virtual channel support is explicitly enabled in the configuration
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Verify xrdp service is active and accepting connectionsRun 'systemctl status xrdp' or check running processes with 'ps aux | grep xrdp' to confirm the service is runningAffected if xrdp daemon is running and the vulnerable code path is active
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Check for xrdp binaries and library filesLocate xrdp installation files via 'which xrdp' and 'find /usr -name "*xrdp*" 2>/dev/null' to confirm the installation pathAffected if The binary or library files exist, indicating an active xrdp installation with the vulnerable component present
You are affected if xrdp version is prior to 0.9.21 and the drdynvc (dynamic virtual channel) feature is enabled or in use for RDP connections.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped0.9.21
Upgrade xrdp to version 0.9.21 or later. No workarounds are available for this issue.
xrdp v0.9.21 or later
- Check current xrdp version: `xrdp --version` or `dpkg -l | grep xrdp`
- Update package lists: `apt update`
- Upgrade xrdp to version 0.9.21 or later: `apt install xrdp` or `apt upgrade xrdp`
- Verify the installed version matches the fixed release (0.9.21 or higher)
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Debian Linux
Scoped from the published advisory
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-23493 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2022-23493 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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