CVE-2023-42822Network attack vector

Process-memory disclosure via unchecked font glyph index

Published Sep 27, 2023 · Updated Nov 3, 2025

Out-of-bounds access in xrdp before 0.9.23.1 allows remote attackers to read process memory through user-controlled font glyph data. xrdp_painter.c indexes the loaded font character array with a user-influenced code point without confirming that the index is within the glyph count. Exploitation requires user interaction; the upstream advisory also identifies a possible subsequent out-of-bounds write, while forking mode prevents a service-wide denial of service.

CVSS severity4.3
Medium
EPSS probability0.64%
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 access in xrdp before 0.9.23.1 allows remote attackers to read process memory through user-controlled font glyph data. xrdp_painter.c indexes the loaded font character array with a user-influenced code point without confirming that the index is within the glyph count. Exploitation requires user interaction; the upstream advisory also identifies a possible subsequent out-of-bounds write, while forking mode prevents a service-wide denial of service.

The record

CVE
CVE-2023-42822
Published
Sep 27, 2023
Updated
Nov 3, 2025
Vendor
neutrinolabs
Product
xrdp
Classifications
T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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=< 0.9.23.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

neutrinolabs · xrdpversion=< 0.9.23.1

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

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

T1210Exploitation of Remote Services

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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