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TI-2023-20493 Aliases CVE-2023-39354

FreeRDP Out-Of-Bounds Read in nsc_rle_decompress_data

Priority LOW 36CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 2 fixed, 3 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-125 and the CVSS impact.

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. Affected versions are subject to an Out-Of-Bounds Read in the `nsc_rle_decompress_data` function. The Out-Of-Bounds Read occurs because it processes `context->Planes` without checking if it contains data of sufficient length. Should an attacker be able to leverage this vulnerability they may be able to cause a crash. This issue has been addressed in versions 2.11.0 and 3.0.0-beta3. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Why it matters now

EPSS 0.01576 75th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial FreeRDP (FreeRDP): 2.11.0, 3.0.0-beta3Red Hat: 1 advisoryRed Hat: 2 fixed, 3 without a fix

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
FreeRDPFreeRDPbefore 2.11.0; 3.0.0-beta1 to before 3.0.0-beta32.11.0, 3.0.0-beta3Patch availableCNA
  • FreeRDP VendorFreeRDP Affected before 2.11.0; 3.0.0-beta1 to before 3.0.0-beta3 Fixed in 2.11.0, 3.0.0-beta3 Patch available CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*before 2.11.0VulnerableFreeRDP
cpe:2.3:a:freerdp:freerdp:3.0.0:beta1:*:*:*:*:*:*3.0.0 beta1VulnerableFreeRDP
cpe:2.3:a:freerdp:freerdp:3.0.0:beta2:*:*:*:*:*:*3.0.0 beta2VulnerableFreeRDP
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*37VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*38VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*39VulnerableFedoraproject
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions before 2.11.0 Vulnerable ·FreeRDP
  • cpe:2.3:a:freerdp:freerdp:3.0.0:beta1:*:*:*:*:*:* Versions 3.0.0 beta1 Vulnerable ·FreeRDP
  • cpe:2.3:a:freerdp:freerdp:3.0.0:beta2:*:*:*:*:*:* Versions 3.0.0 beta2 Vulnerable ·FreeRDP
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* Versions 38 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* Versions 39 Vulnerable ·Fedoraproject

Remediation

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 2.11.0, 3.0.0-beta3

Red Hat 1 advisory

  • RHSA-2024:2208 Released 2024-04-30 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 9) freerdp-2:2.11.2-1.el9, freerdp-libs-2:2.11.2-1.el9, libwinpr-2:2.11.2-1.el9
    • Red Hat Enterprise Linux CRB (v. 9) freerdp-devel-2:2.11.2-1.el9, libwinpr-devel-2:2.11.2-1.el9

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 planned: Out of support scope
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2024:2208
Red Hat Enterprise Linux CRB (v. 9)Fixed RHSA-2024:2208

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-39354

References

Exploit 1

Patch 1

Advisory 1

Other 4

  • 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