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TI-2020-03524 Aliases CVE-2020-4033

OOB Read in RLEDECOMPRESS in FreeRDP

Priority LOW 32CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · None · Low
Fix status
Partial Red Hat: 2 fixed, 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

EPSS 0.01809 78th percentileScored 2026-11-07
Fix Partial FreeRDP (FreeRDP): 2.1.2Red Hat: 1 advisoryRed Hat: 2 fixed, 2 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
FreeRDPFreeRDPbefore 2.1.22.1.2Patch availableCNA
  • FreeRDP VendorFreeRDP Affected before 2.1.2 Fixed in 2.1.2 Patch available CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*before 2.1.2VulnerableFreeRDP
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*31VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*32VulnerableFedoraproject
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*15.1VulnerableopenSUSE
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:esm:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*20.04VulnerableCanonical
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions before 2.1.2 Vulnerable ·FreeRDP
  • cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
  • cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:esm:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* Versions 20.04 Vulnerable ·Canonical
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian

Remediation

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 2.1.2

Red Hat 1 advisory

  • RHSA-2021:1849 Released 2021-05-18 · Red Hat rating Moderate
    freerdp security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) freerdp-devel-2:2.2.0-1.el8
    • Red Hat Enterprise Linux AppStream (v. 8) freerdp-2:2.2.0-1.el8, freerdp-libs-2:2.2.0-1.el8, libwinpr-2:2.2.0-1.el8 +1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    FreeRDP — FEDORA-2020-8d5f86e29a

    9 records Highest priority Priority LOW 9 LOW

    Other records, highest priority first

    • TI-2020-03522 Use-After-Free in gdi_SelectObject in FreeRDPPriority LOW 36
    • TI-2020-08972 OOB Read in license_read_new_or_upgrade_license_packet in FreeRDPPriority LOW 33
    • TI-2020-08969 Global OOB read in update_read_cache_bitmap_v3_order in FreeRDPPriority LOW 33
    Show all 9 records → Advisory →
  • Advisory ·

    FreeRDP — FEDORA-2020-a3432485db

    9 records Highest priority Priority LOW 9 LOW

    Other records, highest priority first

    • TI-2020-03522 Use-After-Free in gdi_SelectObject in FreeRDPPriority LOW 36
    • TI-2020-08972 OOB Read in license_read_new_or_upgrade_license_packet in FreeRDPPriority LOW 33
    • TI-2020-08969 Global OOB read in update_read_cache_bitmap_v3_order in FreeRDPPriority LOW 33
    Show all 9 records → Advisory →
Show 1 more group
  • Advisory ·

    FreeRDP — USN-4481-1

    9 records Highest priority Priority LOW 9 LOW

    Other records, highest priority first

    • TI-2020-03522 Use-After-Free in gdi_SelectObject in FreeRDPPriority LOW 36
    • TI-2020-08972 OOB Read in license_read_new_or_upgrade_license_packet in FreeRDPPriority LOW 33
    • TI-2020-08969 Global OOB read in update_read_cache_bitmap_v3_order in FreeRDPPriority LOW 33
    Show all 9 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:1849
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:1849

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-4033

References

Patch 1

Advisory 7

  • TI-2026-85092 Use-after-free in FreeRDP rdpgfx channel close handling CVSS 4.0CRITICAL 9.3
  • TI-2026-85091 Out-of-bounds write in FreeRDP proxy via bitmap cache v2 capability CVSS 4.0CRITICAL 9.3
  • TI-2026-24435 FreeRDP has a `size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write CVSS 3.1CRITICAL 9.8
  • TI-2023-21373 Out-Of-Bounds Write in FreeRDP CVSS 3.1CRITICAL 9.8
  • TI-2022-08692 Server side NTLM does not properly check parameters in FreeRDP CVSS 3.1CRITICAL 9.1
  • TI-2023-21374 Out-Of-Bounds Read in FreeRDP CVSS 3.1CRITICAL 9.1
See all 336 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences