Buffer overflow in Xilinx Zynq-7000
CVE-2021-27208
When booting a Zync-7000 SOC device from nand flash memory, the nand driver in the ROM does not validate the inputs when reading in any parameters in the nand’s parameter page. IF a field read in from the parameter page is too large, this causes a buffer overflow that could lead to arbitrary code execution. Physical access and modification of the board assembly on which the Zynq-7000 SoC device mounted is needed to replace the original NAND flash memory with a NAND flash emulation device for this attack to be successful.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (29.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.xilinx.com/products/silicon-devices/soc/zynq-7000.html (Product, Vendor Advisory)
- www.xilinx.com/support/answers/76201.html (Vendor Advisory)
- www.onfi.org/specifications (Not Applicable)
Frequently asked questions
- What is CVE-2021-27208?
- CVE-2021-27208 is a medium-severity vulnerability in Xilinx Zynq-7000, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.8/10. Published 2021-03-15.
- How severe is CVE-2021-27208?
- Medium severity. CVSS v3 base score is 6.8 out of 10.