Debian dla-4759 : xrdp - security update

critical Nessus Plugin ID 341538

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 / 12 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4759 advisory.

- ------------------------------------------------------------------------- Debian LTS Advisory DLA-4759-1 [email protected] https://www.debian.org/lts/security/ Abhijith PA August 29, 2026 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : xrdp Version : 0.9.21.1-1~deb11u4 0.9.21.1-1+deb12u3 CVE ID : CVE-2026-32105 CVE-2026-32107 CVE-2026-32623 CVE-2026-32624 CVE-2026-33516 CVE-2026-33689 CVE-2026-41252 CVE-2026-41521 CVE-2026-44178 CVE-2026-44978 CVE-2026-54538 CVE-2026-55238 CVE-2026-55639 CVE-2026-55645

Several vulnerabilities were discovered in xrdp, a Remote Desktop Protocol (RDP) server.

CVE-2026-32105

modify encrypted traffic in transit without detection

CVE-2026-32107

improper privilege management allow attacker to escalate privileges to root and execute arbitrary code.

CVE-2026-32623

heap-based buffer overflow vulnerability

CVE-2026-32624

heap-based buffer overflow vulnerability

CVE-2026-33516

out-of-bounds read vulnerability

CVE-2026-33689

out-of-bounds read vulnerability

CVE-2026-41252

missing bounds check in xrdp, which allows a heap-based buffer overflow

CVE-2026-41521

integer overflow vulnerability

CVE-2026-44178

heap-based buffer overflow vulnerability

CVE-2026-44978

heap out-of-bounds read vulnerability

CVE-2026-54538

sending a specially crafted packet that forces the process into an infinite, CPU-bound loop

CVE-2026-55238

Denial of Service

CVE-2026-55639

exploit by specially crafted RDP malformed data and read out-of-bound data block.

CVE-2026-55645

out-of-bounds memory reads

For Debian 11 bullseye, these problems have been fixed in version 0.9.21.1-1~deb11u4.

For Debian 12 bookworm, these problems have been fixed in version 0.9.21.1-1+deb12u3.

We recommend that you upgrade your xrdp packages.

For the detailed security status of xrdp please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/xrdp

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the xrdp packages.

Plugin Details

Severity: Critical

ID: 341538

File Name: debian_DLA-4759.nasl

Version: 1.2

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 8/29/2026

Updated: 8/29/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 97

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:C

CVSS Score Source: CVE-2026-41521

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 7.9

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:H/SI:H/SA:L

CVSS Score Source: CVE-2026-32105

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:xrdp

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 8/29/2026

Vulnerability Publication Date: 4/17/2026

Reference Information

CVE: CVE-2026-32105, CVE-2026-32107, CVE-2026-32623, CVE-2026-32624, CVE-2026-33516, CVE-2026-33689, CVE-2026-41252, CVE-2026-41521, CVE-2026-44178, CVE-2026-44978, CVE-2026-54538, CVE-2026-55238, CVE-2026-55639, CVE-2026-55645

Detections

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