Is CVE-2021-41159 in the CISA KEV catalog?

No. CVE-2021-41159 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-41159?

CVE-2021-41159 has a CVSS v3 base score of 5.8 (MEDIUM).

What is the EPSS score for CVE-2021-41159?

CVE-2021-41159 has an EPSS score of 1.35% (68th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-41159?

Upgrade freerdp2 on debian 12 to 2.4.1+dfsg1-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-41159

MEDIUM

5.8

CVSS v3

NVD

Description

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. All FreeRDP clients prior to version 2.4.1 using gateway connections (`/gt:rpc`) fail to validate input data. A malicious gateway might allow client memory to be written out of bounds. This issue has been resolved in version 2.4.1. If you are unable to update then use `/gt:http` rather than /gt:rdp connections if possible or use a direct connection without a gateway.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

freerdp2Debian

Fixed in:2.4.1+dfsg1-1CVE-2021-41159

freerdp2Ubuntu

Fixed in:2.2.0+dfsg1-0ubuntu0.18.04.2USN-5154-1

Fixed in:2.2.0+dfsg1-0ubuntu0.20.04.2USN-5154-1

libfreerdp-client2-2Ubuntu

Fixed in:2.2.0+dfsg1-0ubuntu0.18.04.2USN-5154-1

Fixed in:2.2.0+dfsg1-0ubuntu0.20.04.2USN-5154-1

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 RequiredHigh

User InteractionNone

ScopeChanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.35%probability of exploitation in 30 days

68thpercentile

Moderate risk: more likely to be exploited than 68% of all known CVEs.

References

Third-Party Advisory2

Other references1

lists.fedoraproject.org

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	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 2024-11-21.