When booting a Zync-7000 SOC device from nand flash memory, the nand driver in the ROM…
Key facts
- Attack vector
- Physical
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:xilinx:zynq-7000s_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Xilinx |
| cpe:2.3:h:xilinx:zynq-7000s:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Xilinx |
| cpe:2.3:o:xilinx:zynq-7000_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Xilinx |
| cpe:2.3:h:xilinx:zynq-7000:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Xilinx |
- cpe:2.3:o:xilinx:zynq-7000s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Xilinx
- cpe:2.3:h:xilinx:zynq-7000s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Xilinx
- cpe:2.3:o:xilinx:zynq-7000_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Xilinx
- cpe:2.3:h:xilinx:zynq-7000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Xilinx
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-27208
- 2026-10-03 Alias added: GHSA-pm8p-867f-r9w3
References
More Xilinx Zynq-7000 Firmware vulnerabilities
- TI-2022-07840 Incorrect authorization in AMD-Xilinx Zynq-7000 SoC FSBL CVSS 3.1MEDIUM 6.8
Sources
- CVE-2021-27208 · CVE Program
- CVE-2021-27208 · NVD
- FIRST EPSS
- GHSA-pm8p-867f-r9w3 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences