ubuntu-cve-2021-40327
Vulnerability from osv_ubuntu
Published
2022-01-13 16:15
Modified
2026-01-20 04:58
Summary
Details

Trusted Firmware-M (TF-M) 1.4.0, when Profile Small is used, has incorrect access control. NSPE can access a secure key (held by the Crypto service) based solely on knowledge of its key ID. For example, there is no authorization check associated with the relationship between a caller and a key owner.

Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
N/A (UNKNOWN)
high
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "arm-trusted-firmware",
            "binary_version": "2.2-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "arm-trusted-firmware",
        "purl": "pkg:deb/ubuntu/arm-trusted-firmware@2.2-2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1-3",
        "2.2-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "arm-trusted-firmware",
            "binary_version": "2.6+dfsg-1"
          },
          {
            "binary_name": "arm-trusted-firmware-tools",
            "binary_version": "2.6+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "arm-trusted-firmware",
        "purl": "pkg:deb/ubuntu/arm-trusted-firmware@2.6+dfsg-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.5+dfsg-1",
        "2.6+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "arm-trusted-firmware",
            "binary_version": "2.10.0+dfsg-1build2"
          },
          {
            "binary_name": "arm-trusted-firmware-tools",
            "binary_version": "2.10.0+dfsg-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "arm-trusted-firmware",
        "purl": "pkg:deb/ubuntu/arm-trusted-firmware@2.10.0+dfsg-1build2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.9.0+dfsg-3",
        "2.10.0+dfsg-1",
        "2.10.0+dfsg-1build1",
        "2.10.0+dfsg-1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "arm-trusted-firmware",
            "binary_version": "2.10.0+dfsg-1build2"
          },
          {
            "binary_name": "arm-trusted-firmware-tools",
            "binary_version": "2.10.0+dfsg-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "arm-trusted-firmware",
        "purl": "pkg:deb/ubuntu/arm-trusted-firmware@2.10.0+dfsg-1build2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.10.0+dfsg-1build2"
      ]
    }
  ],
  "aliases": [],
  "details": "Trusted Firmware-M (TF-M) 1.4.0, when Profile Small is used, has incorrect access control. NSPE can access a secure key (held by the Crypto service) based solely on knowledge of its key ID. For example, there is no authorization check associated with the relationship between a caller and a key owner.",
  "id": "UBUNTU-CVE-2021-40327",
  "modified": "2026-01-20T04:58:41Z",
  "published": "2022-01-13T16:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-40327"
    },
    {
      "type": "REPORT",
      "url": "https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/"
    },
    {
      "type": "REPORT",
      "url": "https://developer.arm.com/support/arm-security-updates"
    },
    {
      "type": "REPORT",
      "url": "https://tf-m-user-guide.trustedfirmware.org/docs/security/security_advisories/profile_small_key_id_encoding_vulnerability.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-40327"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "high",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-40327"
  ],
  "withdrawn": "2026-04-08T12:25:04Z"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • 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.


Detection rules are retrieved from Rulezet.