Is CVE-2023-40184 in the CISA KEV catalog?

No. CVE-2023-40184 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-40184?

CVE-2023-40184 has a CVSS v3 base score of 2.6 (LOW).

What is the EPSS score for CVE-2023-40184?

CVE-2023-40184 has an EPSS score of 0.73% (50th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-40184?

Upgrade xrdp on debian 11 to 0.9.21.1-1~deb11u2 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2023-40184

LOW

2.6

CVSS v3

NVD

Description

xrdp is an open source remote desktop protocol (RDP) server. In versions prior to 0.9.23 improper handling of session establishment errors allows bypassing OS-level session restrictions. The `auth_start_session` function can return non-zero (1) value on, e.g., PAM error which may result in in session restrictions such as max concurrent sessions per user by PAM (ex ./etc/security/limits.conf) to be bypassed. Users (administrators) don't use restrictions by PAM are not affected. This issue has been addressed in release version 0.9.23. Users are advised to upgrade. There are no known workarounds for this issue.

CWE-755

How to fix

Remediation Available

xrdpDebian

Fixed in:0.9.21.1-1~deb11u2CVE-2023-40184

Fixed in:0.9.21.1-1+deb12u1CVE-2023-40184

Fixed in:0.9.24-2CVE-2023-40184

xorgxrdpUbuntu

Fixed in:0.9.5-2ubuntu0.1~esm3USN-8476-1

xrdpUbuntu

Fixed in:0.6.0-1ubuntu0.1+esm3USN-6474-1

Fixed in:0.6.1-2ubuntu0.3+esm3USN-6474-1

Fixed in:0.9.5-2ubuntu0.1~esm2USN-6474-1

Fixed in:0.9.5-2ubuntu0.1~esm3USN-8476-1

Fixed in:0.9.12-1ubuntu0.1+esm2USN-8476-1

Fixed in:0.9.12-1ubuntu0.1+esm1USN-6474-1

Fixed in:0.9.17-2ubuntu3+esm2USN-8476-1

Fixed in:0.9.17-2ubuntu2+esm1USN-6474-1

Fixed in:0.9.24-4ubuntu0.1~esm1USN-8476-1

Fixed in:0.10.1-3.1+deb13u1build0.25.10.1USN-8476-1

xrdp-pulseaudio-installerUbuntu

Fixed in:0.9.5-2ubuntu0.1~esm3USN-8476-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.73%probability of exploitation in 30 days

50thpercentile

Moderate risk: more likely to be exploited than 50% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

github.com

Mailing List3

Product1

github.com

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-755 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-5638	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-7247	Critical	9.8	99%	KEV	Fix
CVE-2023-36933	High	7.5	72%	-	Fix
CVE-2018-0934	High	7.5	66%	-	Fix
CVE-2019-14287	High	8.8	64%	-	Fix
CVE-2019-12815	Critical	9.8	58%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-03.