CVE-2020-4033

Name: CVE-2020-4033
Creator: NVD / NIST
Published: 2020-06-22T22:15:13.353+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.84%

Last modified Jun 17, 2026

CVE-2020-4033 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 1.84% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.84%

76.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Freerdp	Freerdp	< 2.1.2
Fedoraproject	Fedora	31
Fedoraproject	Fedora	32
Opensuse	Leap	15.1
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	20.04
Debian	Debian Linux	10.0

References

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00080.htmlMailing List, Third Party Advisory
http://www.freerdp.com/2020/06/22/2_1_2-releasedRelease Notes, Vendor Advisory
https://github.com/FreeRDP/FreeRDP/commit/0a98c450c58ec150e44781c89aa6f8e7e0f571f5Patch, Third Party Advisory
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7rhj-856w-82p8Mitigation, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00008.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6Y35HBHG2INICLSGCIKNAR7GCXEHQACQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XOZLH35OJWIQLM7FYDXAP2EAUBDXE76V/
https://usn.ubuntu.com/4481-1/Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00080.htmlMailing List, Third Party Advisory
http://www.freerdp.com/2020/06/22/2_1_2-releasedRelease Notes, Vendor Advisory
https://github.com/FreeRDP/FreeRDP/commit/0a98c450c58ec150e44781c89aa6f8e7e0f571f5Patch, Third Party Advisory
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7rhj-856w-82p8Mitigation, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00008.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6Y35HBHG2INICLSGCIKNAR7GCXEHQACQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XOZLH35OJWIQLM7FYDXAP2EAUBDXE76V/
https://usn.ubuntu.com/4481-1/Third Party Advisory

Timeline

Published: Jun 22, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-4033?

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.

How severe is CVE-2020-4033?

CVE-2020-4033 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.84% probability of exploitation in the next 30 days.

How do I fix CVE-2020-4033?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-4033?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST