CVE-2021-33627 (GCVE-0-2021-33627)

Vulnerability from cvelistv5 – Published: 2022-02-03 01:30 – Updated: 2026-08-11 12:22
VLAI
Summary
An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.09.11, 5.1 before 05.17.11, 5.2 before 05.27.11, 5.3 before 05.36.11, 5.4 before 05.44.11, and 5.5 before 05.52.11 affecting FwBlockServiceSmm. Software SMI services that use the Communicate() function of the EFI_SMM_COMMUNICATION_PROTOCOL do not check whether the address of the buffer is valid, which allows use of SMRAM, MMIO, or OS kernel addresses.
Severity
8.2 (High)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE
  • n/a
Assigner
References
Impacted products
Vendor Product Version
Siemens RUGGEDCOM APE1808 - BIOS Affected: 0 , < V1.0.202N (custom)
Create a notification for this product.
Siemens SIMATIC Field PG M5 Affected: 0 , < V22.01.10 (custom)
Create a notification for this product.
Siemens SIMATIC Field PG M6 Affected: 0 , < V26.01.13 (custom)
Create a notification for this product.
Siemens SIMATIC IPC127E Affected: 0 , < V27.01.09 (custom)
Create a notification for this product.
Siemens SIMATIC IPC227G Affected: 0 , < V28.01.04 (custom)
Create a notification for this product.
Siemens SIMATIC IPC277G Affected: 0 , < V28.01.04 (custom)
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Siemens SIMATIC IPC277G PRO Affected: 0 , < V28.01.04 (custom)
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Siemens SIMATIC IPC327G Affected: 0 , < V28.01.04 (custom)
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Siemens SIMATIC IPC377G Affected: 0 , < V28.01.04 (custom)
Create a notification for this product.
Siemens SIMATIC IPC427E Affected: 0 , < V21.01.17 (custom)
Create a notification for this product.
Siemens SIMATIC IPC477E Affected: 0 , < V21.01.17 (custom)
Create a notification for this product.
Siemens SIMATIC IPC477E PRO Affected: 0 , < V21.01.17 (custom)
Create a notification for this product.
Siemens SIMATIC IPC627E Affected: 0 , < V25.02.12 (custom)
Create a notification for this product.
Siemens SIMATIC IPC647E Affected: 0 , < V25.02.12 (custom)
Create a notification for this product.
Siemens SIMATIC IPC677E Affected: 0 , < V25.02.12 (custom)
Create a notification for this product.
Siemens SIMATIC IPC847E Affected: 0 , < V25.02.12 (custom)
Create a notification for this product.
Siemens SIMATIC ITP1000 Affected: 0 , < V23.01.10 (custom)
Create a notification for this product.
Siemens SIPLUS IPC427E Affected: 0 , < V21.01.17 (custom)
Create a notification for this product.
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      "id": "CVE-2021-33627",
      "lastModified": "2024-11-21T06:09:13.607",
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      "published": "2022-02-03T02:15:06.983",
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      "sourceIdentifier": "cve@mitre.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-119\"}]}]"
    },
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Advisory\"]},{\"url\":\"https://www.kb.cert.org/vuls/id/796611\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-306654.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "current_release_date": "2026-01-09T11:26:45+00:00",
      "cve": "CVE-2021-33627",
      "id": "CVE-2021-33627",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "CVE-2021-33627",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-33627.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





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

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.


Detection rules are retrieved from Rulezet.