Is CVE-2020-4033 in the CISA KEV catalog?

No. CVE-2020-4033 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-4033?

CVE-2020-4033 has a CVSS v3 base score of 3.1 (LOW).

What is the EPSS score for CVE-2020-4033?

CVE-2020-4033 has an EPSS score of 1.84% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-4033?

Upgrade freerdp2 on debian 11 to 2.1.2+dfsg1-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2020-4033

LOWEPSS 76th pctl

3.1

CVSS v3

NVD

Description

In FreeRDP before version 2.1.2, there is an out of bounds read in RLEDECOMPRESS. All FreeRDP based clients with sessions with color depth < 32 are affected. This is fixed in version 2.1.2.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

freerdp2Debian

Fixed in:2.1.2+dfsg1-1CVE-2020-4033

freerdp2Ubuntu

Fixed in:2.2.0+dfsg1-0ubuntu0.18.04.1USN-4481-1

Fixed in:2.2.0+dfsg1-0ubuntu0.20.04.1USN-4481-1

libfreerdp-client2-2Ubuntu

Fixed in:2.2.0+dfsg1-0ubuntu0.18.04.1USN-4481-1

Fixed in:2.2.0+dfsg1-0ubuntu0.20.04.1USN-4481-1

libfreerdp-server2-2Ubuntu

Fixed in:2.2.0+dfsg1-0ubuntu0.18.04.1USN-4481-1

Fixed in:2.2.0+dfsg1-0ubuntu0.20.04.1USN-4481-1

libfreerdp2-2Ubuntu

Fixed in:2.2.0+dfsg1-0ubuntu0.18.04.1USN-4481-1

Fixed in:2.2.0+dfsg1-0ubuntu0.20.04.1USN-4481-1

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.84%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

freerdp.com

Mitigation1

github.com

Third-Party Advisory3

Other references2

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	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.