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CVE-2026-33516

xrdp: Pre-authentication out-of-bounds reads in RDP capability and channel parsers

7.7 HighFix available

xrdp is an open source RDP server. Versions through 0.10.5 contain an out-of-bounds read vulnerability during the RDP capability exchange phase. The issue occurs when memory is accessed before validating the remaining buffer length. A remote, unauthenticated attacker can trigger this vulnerability by sending a specially crafted Confirm Active PDU. Successful exploitation could lead to a denial of service (process crash) or potential disclosure of sensitive information from the process memory. This issue has been fixed in version 0.10.6.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Passive

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.43%Up 0.3 points since Apr 18, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.7

xrdp: Pre-authentication out-of-bounds reads in RDP capability and channel parsers

xrdp is an open source RDP server. Versions through 0.10.5 contain an out-of-bounds read vulnerability during the RDP capability exchange phase. The issue occurs when memory is accessed before validating the remaining buffer length. A remote, unauthenticated attacker can trigger this vulnerability by sending a specially crafted Confirm Active PDU. Successful exploitation could lead to a denial of service (process crash) or potential disclosure of sensitive information from the process memory. This issue has been fixed in version 0.10.6.

Record
CVE-2026-33516
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-125
Updated
2026-11-02
EUVDEUVD-2026-23515 7.7

xrdp is an open source RDP server. Versions through 0.10.5 contain an out-of-bounds read vulnerability during the RDP capability exchange phase. The issue occurs when memory is accessed before validating the remaining buffer length. A remote, unauthenticated attacker can trigger this vulnerability by sending a specially crafted Confirm Active PDU. Successful exploitation could lead to a denial of service (process crash) or potential disclosure of sensitive information from the process memory. This issue has been fixed in version 0.10.6.

Record
EUVD-2026-23515
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
NVD 7.7

xrdp is an open source RDP server. Versions through 0.10.5 contain an out-of-bounds read vulnerability during the RDP capability exchange phase. The issue occurs when memory is accessed before validating the remaining buffer length. A remote, unauthenticated attacker can trigger this vulnerability by sending a specially crafted Confirm Active PDU. Successful exploitation could lead to a denial of service (process crash) or potential disclosure of sensitive information from the process memory. This issue has been fixed in version 0.10.6.

Record
CVE-2026-33516
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness
CWE-125
Updated
2026-11-02
OSVALPINE-CVE-2026-33516 9.1

xrdp is an open source RDP server. Versions through 0.10.5 contain an out-of-bounds read vulnerability during the RDP capability exchange phase. The issue occurs when memory is accessed before validating the remaining buffer length. A remote, unauthenticated attacker can trigger this vulnerability by sending a specially crafted Confirm Active PDU. Successful exploitation could lead to a denial of service (process crash) or potential disclosure of sensitive information from the process memory. This issue has been fixed in version 0.10.6.

Record
ALPINE-CVE-2026-33516
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated
2026-11-03
OSV 7.7

xrdp: Pre-authentication out-of-bounds reads in RDP capability and channel parsers

xrdp is an open source RDP server. Versions through 0.10.5 contain an out-of-bounds read vulnerability during the RDP capability exchange phase. The issue occurs when memory is accessed before validating the remaining buffer length. A remote, unauthenticated attacker can trigger this vulnerability by sending a specially crafted Confirm Active PDU. Successful exploitation could lead to a denial of service (process crash) or potential disclosure of sensitive information from the process memory. This issue has been fixed in version 0.10.6.

Record
CVE-2026-33516
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-125
Updated
2026-11-02
OSVDEBIAN-CVE-2026-33516 9.1

xrdp is an open source RDP server. Versions through 0.10.5 contain an out-of-bounds read vulnerability during the RDP capability exchange phase. The issue occurs when memory is accessed before validating the remaining buffer length. A remote, unauthenticated attacker can trigger this vulnerability by sending a specially crafted Confirm Active PDU. Successful exploitation could lead to a denial of service (process crash) or potential disclosure of sensitive information from the process memory. This issue has been fixed in version 0.10.6.

Record
DEBIAN-CVE-2026-33516
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-33516 7.7

xrdp is an open source RDP server. Versions through 0.10.5 contain an out-of-bounds read vulnerability during the RDP capability exchange phase. The issue occurs when memory is accessed before validating the remaining buffer length. A remote, unauthenticated attacker can trigger this vulnerability by sending a specially crafted Confirm Active PDU. Successful exploitation could lead to a denial of service (process crash) or potential disclosure of sensitive information from the process memory. This issue has been fixed in version 0.10.6.

Record
UBUNTU-CVE-2026-33516
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
xrdp
Alpine:v3.23
before 0.10.6-r0
0.10.6-r0
xrdp
Alpine:v3.24
before 0.10.6-r0
0.10.6-r0
xrdp
Debian:12
before 0.9.21.1-1+deb12u3, plus listed versions
0.9.21.1-10.9.21.1-1+deb12u10.9.21.1-1+deb12u2
0.9.21.1-1+deb12u3
xrdp
Debian:13
before 0.10.1-3.1+deb13u2, plus listed versions
0.10.1-3.10.10.1-3.1+deb13u1
0.10.1-3.1+deb13u2
xrdp
Debian:14
before 0.10.6-1, plus listed versions
0.10.1-3.10.10.1-40.10.1-4.10.10.2-10.10.2-2
Show 7 moreShow less
0.10.4.1-10.10.4.1-20.10.5-10.10.5-20.10.5-30.10.5-40.10.5-5
0.10.6-1
xrdp
Ubuntu:Pro:14.04:LTS
All versions, plus listed versions
0.6.0-10.6.0-1ubuntu0.10.6.0-1ubuntu0.1+esm10.6.0-1ubuntu0.1+esm20.6.0-1ubuntu0.1+esm3
None known
xrdp
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
0.6.1-20.6.1-2ubuntu0.10.6.1-2ubuntu0.30.6.1-2ubuntu0.3+esm10.6.1-2ubuntu0.3+esm20.6.1-2ubuntu0.3+esm3
None known
xrdp
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
0.9.1-90.9.4-10.9.4-20.9.4-30.9.4-4
Show 7 moreShow less
0.9.4-50.9.5-10.9.5-1build10.9.5-20.9.5-2ubuntu0.1~esm10.9.5-2ubuntu0.1~esm20.9.5-2ubuntu0.1~esm3
None known
xrdp
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
0.9.9-10.9.12-10.9.12-1ubuntu0.10.9.12-1ubuntu0.1+esm10.9.12-1ubuntu0.1+esm2
None known
xrdp
Ubuntu:22.04:LTS
All versions, plus listed versions
0.9.15-1ubuntu10.9.17-10.9.17-20.9.17-2ubuntu10.9.17-2ubuntu2
Show 5 moreShow less
0.9.17-2ubuntu2+esm10.9.17-2ubuntu30.9.17-2ubuntu3+esm10.9.17-2ubuntu3+esm20.9.17-2ubuntu3.1
None known
Show 4 moreShow less
Affected packages
PackageAffectedFixed
xrdp
Ubuntu:24.04:LTS
All versions, plus listed versions
0.9.21.1-10.9.24-20.9.24-30.9.24-3build10.9.24-3build20.9.24-40.9.24-4ubuntu0.1~esm10.9.24-4ubuntu0.1
None known
xrdp
Ubuntu:25.10
All versions, plus listed versions
0.10.1-30.10.1-3.10.10.1-3.1+deb13u1build0.25.10.1
None known
xrdp
Ubuntu:26.10
All versions, plus listed versions
0.10.1-4.10.10.6.1-2ubuntu1
None known
xrdp
Ubuntu:26.04:LTS
All versions, plus listed versions
0.10.1-3.10.10.1-40.10.1-4.10.10.1-4.1ubuntu0.1
None known

History

History
RecordedChangedSources
affected, aliases, referencesOSV
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-33516 is a high vulnerability (CVSS 7.7) in Neutrinolabs Xrdp, published April 17, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.43%, the 37th percentile. Fixed in xrdp 0.10.6-r0.

References

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