CVE-2026-23530
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk36th percentile - higher than 36% of all known CVEs
Summary
In FreeRDP prior to version 3.21.0, the `freerdp_bitmap_decompress_planar` function does not validate `nSrcWidth`/`nSrcHeight` against `planar->maxWidth`/`maxHeight` before RLE decode. A malicious server can trigger a client-side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code-execution risk.
Risk Assessment
The organization is exposed to denial-of-service (DoS) attacks and potential remote code execution via a malicious RDP server, which could lead to client machine compromise and data exfiltration.
Recommendation
Immediately upgrade FreeRDP to version 3.21.0 or later, which includes a fix for this vulnerability.
Original NVD description (English source)
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0,`freerdp_bitmap_decompress_planar` does not validate `nSrcWidth`/`nSrcHeight` against `planar->maxWidth`/`maxHeight` before RLE decode. 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.