PT-2026-2938
CVE-2026-22858
·
Published
2025-01-14
·
Updated
2026-09-20
Description by
CVSS 4.0
9.3
CriticalMetricsAV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Name of the Vulnerable Software and Affected Versions
FreeRDP versions prior to 3.20.1
Description
FreeRDP, a free implementation of the Remote Desktop Protocol, contains a flaw related to Base64 decoding. A global-buffer-overflow can occur due to implementation-defined char signedness on Arm/AArch64 builds. Specifically, non-ASCII bytes may bypass range restrictions and be used as an index into a global lookup table, leading to out-of-bounds access. The issue stems from the optimization of a guard condition (
c <= 0) into a simple check (c != 0) when char is treated as unsigned.Recommendations
Update to version 3.20.1 or later.
Exploitability
Exploit
Fix
Impacts
Researchers
Vendors
Affected products
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