FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow occurs in the ClearCodec bands decode path when crafted band coordinates allow writes past the end of the destination surface buffer. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Wed, 28 Jan 2026 18:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 7.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H'}

cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Tue, 20 Jan 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 20 Jan 2026 08:45:00 +0000

Type Values Removed Values Added
First Time appeared Freerdp
Freerdp freerdp
Vendors & Products Freerdp
Freerdp freerdp

Tue, 20 Jan 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H'}

threat_severity

Important


Mon, 19 Jan 2026 17:30:00 +0000

Type Values Removed Values Added
Description FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow occurs in the ClearCodec bands decode path when crafted band coordinates allow writes past the end of the destination surface buffer. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.
Title FreeRDP has heap-buffer-overflow in clear_decompress_bands_data
Weaknesses CWE-122
References
Metrics cvssV4_0

{'score': 7.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-20T14:42:31.717Z

Reserved: 2026-01-13T18:22:43.981Z

Link: CVE-2026-23534

cve-icon Vulnrichment

Updated: 2026-01-20T14:42:24.792Z

cve-icon NVD

Status : Analyzed

Published: 2026-01-19T18:16:05.307

Modified: 2026-01-28T18:44:11.970

Link: CVE-2026-23534

cve-icon Redhat

Severity : Important

Publid Date: 2026-01-19T17:09:55Z

Links: CVE-2026-23534 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-01-20T08:40:50Z

Weaknesses