by Kastro CVE-2026-23533
FreeRDP FreeRDP — FreeRDP has heap-buffer-overflow in clear_decompress_residual_data
Description · from the CVE record
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 RDPGFX ClearCodec decode path when maliciously crafted residual data causes out-of-bounds writes during color output. 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.
Affected
ProductAffectedFixed inSource
FreeRDP< 3.21.0–CNA
Red Hat Enterprise Linux 10see advisory2:3.10.3-5.el10_1.1redhat-SADP
Red Hat Enterprise Linux 10.0 Extended Update Supportsee advisory2:3.10.3-3.el10_0.1redhat-SADP
Red Hat Enterprise Linux 7 Extended Lifecycle Supportsee advisory0:2.1.1-5.el7_9.1redhat-SADP
Red Hat Enterprise Linux 8see advisory2:2.11.7-2.el8_10redhat-SADP
Red Hat Enterprise Linux 8.2 Advanced Update Supportsee advisory2:2.0.0-46.rc4.el8_2.6redhat-SADP
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportsee advisory2:2.2.0-7.el8_4redhat-SADP
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onsee advisory2:2.2.0-7.el8_4redhat-SADP
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportsee advisory2:2.2.0-7.el8_6.1redhat-SADP
Red Hat Enterprise Linux 8.6 Telecommunications Update Servicesee advisory2:2.2.0-7.el8_6.1redhat-SADP
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutionssee advisory2:2.2.0-7.el8_6.1redhat-SADP
Red Hat Enterprise Linux 8.8 Telecommunications Update Servicesee advisory2:2.2.0-12.el8_8.1redhat-SADP
Scores by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)7.7CVSS: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
redhat-SADP (CNA)7.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: partial