Upstream information
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.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having important severity.
| CVSS detail | CNA (VulnCheck) | National Vulnerability Database | SUSE |
|---|---|---|---|
| Base Score | 9.8 | 9.1 | 8.2 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H |
| Attack Vector | Network | Network | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality Impact | High | None | None |
| Integrity Impact | High | High | Low |
| Availability Impact | High | High | High |
| CVSSv3 Version | 3.1 | 3.1 | 3.1 |
| CVSS detail | CNA (VulnCheck) | SUSE |
|---|---|---|
| Base Score | 9.3 | 8.8 |
| Vector | CVSS:4.0/AV: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 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N |
| Attack Vector | Network | Network |
| Attack Complexity | Low | Low |
| Attack Requirements | None | None |
| Privileges Required | None | None |
| User Interaction | None | None |
| Vulnerable System Confidentiality Impact | High | None |
| Vulnerable System Integrity Impact | High | Low |
| Vulnerable System Availability Impact | High | High |
| Subsequent System Confidentiality Impact | None | None |
| Subsequent System Integrity Impact | None | None |
| Subsequent System Availability Impact | None | None |
| CVSSv4 Version | 4.0 | 4.0 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP7 | freerdp | Affected |
| SUSE Linux Enterprise Desktop 15 SP7 | freerdp2 | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | freerdp | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | freerdp2 | Affected |
| SUSE Linux Enterprise Server 15 SP7 | freerdp | Affected |
| SUSE Linux Enterprise Server 15 SP7 | freerdp2 | Affected |
| SUSE Linux Enterprise Server 16.0 | freerdp | Affected |
| SUSE Linux Enterprise Server 16.1 | freerdp | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | freerdp | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | freerdp2 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | freerdp | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | freerdp | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP7 | freerdp | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP7 | freerdp2 | Affected |
| openSUSE Leap 16.0 | freerdp | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 12 SP5 | freerdp | Affected |
| SUSE Linux Enterprise Server 12 SP5 | freerdp | Affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS | freerdp | Affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security | freerdp | Affected |
| SUSE Linux Enterprise Server 15 SP4 | freerdp | Affected |
| SUSE Linux Enterprise Server 15 SP5 | freerdp | Affected |
| SUSE Linux Enterprise Server 15 SP6 | freerdp | Affected |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | freerdp | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | freerdp | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | freerdp | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Linux Enterprise Desktop 12 SP2 | freerdp | Affected |
| SUSE Linux Enterprise Desktop 12 SP3 | freerdp | Affected |
| SUSE Linux Enterprise Desktop 12 SP4 | freerdp | Affected |
| SUSE Linux Enterprise Desktop 15 SP4 | freerdp | Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | freerdp | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | freerdp | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP4 | freerdp | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | freerdp | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | freerdp | Affected |
| SUSE Linux Enterprise Server 12 SP2 | freerdp | Affected |
| SUSE Linux Enterprise Server 12 SP3 | freerdp | Affected |
| SUSE Linux Enterprise Server 12 SP4 | freerdp | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2 | freerdp | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | freerdp | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | freerdp | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | freerdp | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | freerdp | Affected |
| SUSE Linux Enterprise Software Development Kit 12 SP2 | freerdp | Affected |
| SUSE Linux Enterprise Software Development Kit 12 SP3 | freerdp | Affected |
| SUSE Linux Enterprise Software Development Kit 12 SP4 | freerdp | Affected |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | freerdp | Affected |
| SUSE Linux Enterprise Workstation Extension 12 SP2 | freerdp | Affected |
| SUSE Linux Enterprise Workstation Extension 12 SP3 | freerdp | Affected |
| SUSE Linux Enterprise Workstation Extension 12 SP4 | freerdp | Affected |
| SUSE Linux Enterprise Workstation Extension 12 SP5 | freerdp | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP4 | freerdp | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP5 | freerdp | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP6 | freerdp | Affected |
| openSUSE Leap 15.4 | freerdp | Affected |
| openSUSE Leap 15.5 | freerdp | Affected |
| openSUSE Leap 15.6 | freerdp | Affected |
SUSE Timeline for this CVE
CVE page created: Fri Jul 31 17:37:34 2026CVE page last modified: Fri Jul 31 20:41:37 2026