What’s Vulnerable › Vulnerabilities

CVE-2021-44850

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-02-10 · updated 2026-06-17
• Weakness: CWE-345

Description

On Xilinx Zynq-7000 SoC devices, physical modification of an SD boot image allows for a buffer overflow attack in the ROM. Because the Zynq-7000's boot image header is unencrypted and unauthenticated before use, an attacker can modify the boot header stored on an SD card so that a secure image appears to be unencrypted, and they will be able to modify the full range of register initialization values. Normally, these registers will be restricted when booting securely. Of importance to this attack are two registers that control the SD card's transfer type and transfer size. These registers could be modified a way that causes a buffer overflow in the ROM.

Affected products

• AMD Xilinx Z-7007S Firmware: all versions
• AMD Xilinx Z-7010 Firmware: all versions
• AMD Xilinx Z-7012S Firmware: all versions
• AMD Xilinx Z-7014S Firmware: all versions
• AMD Xilinx Z-7015 Firmware: all versions
• AMD Xilinx Z-7020 Firmware: all versions
• AMD Xilinx Z-7030 Firmware: all versions
• AMD Xilinx Z-7035 Firmware: all versions
• AMD Xilinx Z-7045 Firmware: all versions
• AMD Xilinx Z-7100 Firmware: all versions

References

• https://support.xilinx.com/s/article/47915
• https://support.xilinx.com/s/article/76964
• https://support.xilinx.com/s/article/47915
• https://support.xilinx.com/s/article/76964

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