Vulnerability-Lookup

FKIE_CVE-2021-27208

Vulnerability from fkie_nvd - Published: 2021-03-15 13:15 - Updated: 2026-06-17 03:44

Severity

6.8 (Medium) - CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

References

URL	Tags
cve@mitre.org	http://www.onfi.org/specifications	Not Applicable
cve@mitre.org	https://www.xilinx.com/products/silicon-devices/soc/zynq-7000.html	Product, Vendor Advisory
cve@mitre.org	https://www.xilinx.com/support/answers/76201.html	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	http://www.onfi.org/specifications	Not Applicable
af854a3a-2127-422b-91ae-364da2661108	https://www.xilinx.com/products/silicon-devices/soc/zynq-7000.html	Product, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.xilinx.com/support/answers/76201.html	Vendor Advisory

Impacted products

Vendor	Product	Version
xilinx	zynq-7000s_firmware	-
xilinx	zynq-7000s	-
xilinx	zynq-7000_firmware	-
xilinx	zynq-7000	-

JSON

To clipboard

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          "vendor": "n/a",
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      "value": "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\u2019s 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."
    },
    {
      "lang": "es",
      "value": "Cuando se arranca un dispositivo Zync-7000 SOC desde la memoria flash nand, el controlador nand en la ROM no comprueba las entradas cuando se leen en par\u00e1metros any en la p\u00e1gina de par\u00e1metros nand. SI un campo le\u00eddo desde la p\u00e1gina de par\u00e1metros es demasiado grande, esto causa un desbordamiento del b\u00fafer que podr\u00eda conllevar a una ejecuci\u00f3n de c\u00f3digo arbitraria. Es necesario un acceso f\u00edsico y modificaci\u00f3n al dispositivo Zynq-7000 para reemplazar la memoria flash nand original con un emulador flash nand para que este ataque tenga \u00e9xito"
    }
  ],
  "id": "CVE-2021-27208",
  "lastModified": "2026-06-17T03:44:28.000",
  "metrics": {
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        "baseSeverity": "MEDIUM",
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          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.6,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
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        "exploitabilityScore": 3.9,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
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          "availabilityImpact": "HIGH",
          "baseScore": 6.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 0.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  },
  "published": "2021-03-15T13:15:14.967",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Not Applicable"
      ],
      "url": "http://www.onfi.org/specifications"
    },
    {
      "source": "cve@mitre.org",
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    },
    {
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
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  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-120"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-27208 (GCVE-0-2021-27208)

Vulnerability from cvelistv5 – Published: 2021-03-15 12:27 – Updated: 2024-08-03 20:40

Summary

Severity

No CVSS data available.

CWE

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2193 records in the last 180 days details

References

3 references

URL	Tags
https://www.xilinx.com/products/silicon-devices/s…	x_refsource_MISC
https://www.xilinx.com/support/answers/76201.html	x_refsource_MISC
http://www.onfi.org/specifications	x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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