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CVE-2026-64620 is a heap-based buffer overflow in FreeRDP before 3.28.0, affecting versions up to 3.27.1. The flaw is in crypto_rsa_common() in libfreerdp/crypto/crypto.c, where the modular-exponentiation result is written into the caller-provided output buffer via BN_bn2bin() before the code verifies that the result length fits within the destination buffer. Because the bounds check occurs only after the write, out-of-bounds heap writes can occur. On the server-side code path, the issue is reachable when a client negotiates RDP Standard Security. In that flow, the encrypted client random is decrypted into a fixed 32-byte buffer even though a forged RSA ciphertext can decrypt to a value as large as the RSA modulus length. With RSA-2048, this can produce roughly 256 bytes of output and overflow the heap buffer by about 224 attacker-controlled bytes. The vulnerability is reachable remotely and pre-authentication because the server exposes its RSA public key, enabling an unauthenticated attacker to craft suitable ciphertext.
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A FreeRDP heap-based buffer overflow vulnerability that can lead to remote code execution or denial of service.
A FreeRDP heap-based buffer overflow vulnerability that can lead to remote code execution or denial of service.
A FreeRDP heap-based buffer overflow vulnerability that can lead to remote code execution or denial of service.
A critical pre-authentication heap-based buffer overflow in FreeRDP's crypto_rsa_common() that can be triggered remotely against servers using RDP Standard Security, allowing an unauthenticated attacker to overflow a fixed 32-byte heap buffer and cause denial of service.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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