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Debian LinuxOperating system · Debian

CVE-2022-23477

CRITICAL · 9.8 CVSS v3.1 Published 2022-12-09
Fix available
A fix is available. Upgrade to 0.9.21 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
xrdp 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 buffer over flow in audin_send_open() 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 · moderate confidence

xrdp versions prior to 0.9.21 contain a buffer overflow vulnerability in the audin_send_open() function, which handles audio input redirection. This critical flaw (CVSS 9.8) could allow remote attackers to execute arbitrary code or cause a denial of service. No workarounds exist, requiring users to upgrade to v0.9.21 or later.

MitigationUpgrade xrdp to version 0.9.21 or later to remediate this buffer overflow vulnerability; there are no effective workarounds available.

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
Affected:= 11.0
XrdpApplication
Affected:< 0.9.21

CVSS 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
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 checks

Work through these to decide whether this CVE applies to you.

  1. Verify xrdp is installed
    Query the package manager for xrdp. On Debian-based systems: dpkg -l | grep xrdp. On RPM-based: rpm -qa | grep xrdp.
    Affected if xrdp is not installed on the system, the vulnerability does not apply
  2. Determine installed xrdp version
    Run 'xrdp --version' or 'xrdp -v' to display the version number. Alternatively, use package queries: dpkg -l xrdp (Debian) or rpm -qi xrdp (RHEL/CentOS).
    Affected if the displayed version is lower than 0.9.21 (e.g., 0.9.20, 0.9.19, etc.)
  3. Confirm audio input redirection is in use
    Inspect xrdp configuration files for audio input settings. Check /etc/xrdp/xrdp.ini or /etc/xrdp/xrdp.conf for 'audin' module references, or look for audio input redirection settings in the sesman configuration.
    Affected if audio input redirection (audin) is explicitly enabled or configured in xrdp settings; the vulnerability only triggers when this feature is used
  4. Compare against affected version range
    Document the exact version number found and compare it to the affected range: versions prior to 0.9.21 are vulnerable, version 0.9.21 and later are patched.
    Affected if the installed version is less than 0.9.21 and audio input redirection is active

A system is affected if it runs xrdp versions prior to 0.9.21 with audio input redirection enabled, as the buffer overflow in the audin_send_open() function only triggers when this feature is in use.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 0.9.21 or later
Fixed in 0.9.21
Interim mitigation

Upgrade xrdp to version 0.9.21 or later to remediate this buffer overflow vulnerability; there are no effective workarounds available.

Recommended fix High confidence

xrdp >= v0.9.21

  1. Check current xrdp version using: dpkg -l | grep xrdp or rpm -q xrdp
  2. For Debian 11 (bullseye), update package lists: apt update
  3. Upgrade xrdp to version 0.9.21 or later: apt install xrdp (or apt install xrdp=<version> for specific version)
  4. Verify the upgrade was successful by checking the installed version: dpkg -l | grep xrdp
  5. Restart xrdp service if running: systemctl restart xrdp or systemctl restart xrdp-sesman

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Debian Linux Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2022-23477 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data