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Mon, 20 Jul 2026 20:30:00 +0000
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ssvc
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Mon, 20 Jul 2026 12:15:00 +0000
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| Description | FreeRDP before 3.28.0 (affected <=3.27.1) contains a heap-based buffer overflow in crypto_rsa_common() (libfreerdp/crypto/crypto.c). The function writes the modular-exponentiation result into the caller's output buffer via BN_bn2bin() and only afterward checks output_length > out_length, so out-of-bounds bytes are written before the bounds check. On the server side, when a client selects RDP Standard Security, the encrypted client random is decrypted into a fixed 32-byte buffer. Because the server publishes its RSA public key, an unauthenticated attacker can forge a ciphertext whose decrypted value is up to the full modulus length (e.g. 256 bytes for RSA-2048), overflowing the 32-byte heap buffer by up to ~224 attacker-controlled bytes pre-authentication, resulting in denial of service. | |
| Title | FreeRDP before 3.28.0 Heap Buffer Overflow via crypto_rsa_common | |
| First Time appeared |
Freerdp
Freerdp freerdp |
|
| Weaknesses | CWE-122 | |
| CPEs | cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Freerdp
Freerdp freerdp |
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| References |
| |
| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-07-20T19:31:27.240Z
Reserved: 2026-07-20T11:58:54.524Z
Link: CVE-2026-64620
Updated: 2026-07-20T19:27:29.369Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-07-20T22:30:18Z