{"id":"CVE-2021-27208","aliases":["EUVD-2021-13973","GHSA-pm8p-867f-r9w3"],"status":"published","title":"When booting a Zync-7000 SOC device from nand flash memory, the nand driver in the ROM does not...","description":"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.","severity":{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00393,"percentile":0.33927,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120"],"published":"2021-03-15T12:27:26Z","modified":"2026-06-17T03:44:28Z","products":[{"vendor":"xilinx","product":"zynq-7000_firmware"},{"vendor":"xilinx","product":"zynq-7000s_firmware"}],"references":[{"url":"https://www.xilinx.com/products/silicon-devices/soc/zynq-7000.html","tags":["x_refsource_MISC","x_transferred","Product","Vendor Advisory"]},{"url":"https://www.xilinx.com/support/answers/76201.html","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"http://www.onfi.org/specifications","tags":["x_refsource_MISC","x_transferred","Not Applicable"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27208"},{"url":"https://github.com/advisories/GHSA-pm8p-867f-r9w3"}],"sources":{"cve":[{"id":"CVE-2021-27208","description":"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.","status":"published","published":"2021-03-15T12:27:26Z","modified":"2024-08-03T20:40:47.492Z","updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-13973","description":"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.","status":"published","published":"2021-03-15T12:27:26Z","modified":"2024-08-03T20:40:47Z","updated_at":"2026-11-03T03:24:49.808499Z"}],"ghsa":[{"id":"GHSA-pm8p-867f-r9w3","title":"When booting a Zync-7000 SOC device from nand flash memory, the nand driver in the ROM does not...","description":"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 to the Zynq-7000 device is needed to replace the original nand flash memory with a nand flash emulator for this attack to be successful.","status":"published","published":"2022-05-24T22:28:51Z","modified":"2023-01-30T05:05:36Z","cwes":["CWE-120"],"updated_at":"2026-11-02T14:47:18.801591Z"}],"nvd":[{"id":"CVE-2021-27208","description":"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.","status":"published","published":"2021-03-15T13:15:14.967Z","modified":"2026-06-17T03:44:28Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4.6,"vector":"AV:L/AC:L/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:06:50.805771Z"}]}}