Vulnerability-Lookup

CVE-2021-27378 (GCVE-0-2021-27378)

Vulnerability from cvelistv5 – Published: 2021-02-18 03:35 – Updated: 2024-08-03 20:48

Summary

An issue was discovered in the rand_core crate before 0.6.2 for Rust. Because read_u32_into and read_u64_into mishandle certain buffer-length checks, a random number generator may be seeded with too little data.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://rustsec.org/advisories/RUSTSEC-2021-0023.html	x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2021-27378

Vulnerability from fkie_nvd - Published: 2021-02-18 04:15 - Updated: 2026-06-17 03:44

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	cve@mitre.org	https://rustsec.org/advisories/RUSTSEC-2021-0023.html	Third Party Advisory
	af854a3a-2127-422b-91ae-364da2661108	https://rustsec.org/advisories/RUSTSEC-2021-0023.html	Third Party Advisory

Impacted products

	Vendor	Product	Version
	rand_core_project	rand_core	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
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GHSA-W7J2-35MF-95P7

Vulnerability from github – Published: 2021-08-25 20:52 – Updated: 2022-07-13 20:03

Summary

Incorrect check on buffer length in rand_core

Details

An issue was discovered in the rand_core crate before 0.6.2 for Rust. Because read_u32_into and read_u64_into mishandle certain buffer-length checks, a random number generator may be seeded with too little data. The vulnerability was introduced in v0.6.0. The advisory doesn't apply to earlier minor version numbers.

Because read_u32_into and read_u64_into mishandle certain buffer-length checks, a random number generator may be seeded with too little data.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

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        "name": "rand_core"
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        }
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  "database_specific": {
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      "CWE-330"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-08-19T17:35:01Z",
    "nvd_published_at": "2021-02-18T04:15:00Z",
    "severity": "CRITICAL"
  },
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  "id": "GHSA-w7j2-35mf-95p7",
  "modified": "2022-07-13T20:03:17Z",
  "published": "2021-08-25T20:52:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-27378"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-random/rand/pull/1096"
    },
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    },
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      "type": "CVSS_V3"
    }
  ],
  "summary": "Incorrect check on buffer length in rand_core"
}

GSD-2021-27378

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

Aliases

CVE-2021-27378

Aliases

CVE-2021-27378

JSON

To clipboard

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    "description": "An issue was discovered in the rand_core crate before 0.6.2 for Rust. Because read_u32_into and read_u64_into mishandle certain buffer-length checks, a random number generator may be seeded with too little data.",
    "id": "GSD-2021-27378",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-27378.html"
    ]
  },
  "gsd": {
    "metadata": {
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      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
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      "modified": "2023-12-13T01:23:35.998301Z",
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              "name": "https://rustsec.org/advisories/RUSTSEC-2021-0023.html",
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            }
          ]
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      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 7.5,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 6.4,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "HIGH",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2021-02-25T22:30Z",
      "publishedDate": "2021-02-18T04:15Z"
    }
  }
}

MSRC_CVE-2021-27378

Vulnerability from csaf_microsoft - Published: 2021-02-02 00:00 - Updated: 2026-02-18 14:32

Summary

An issue was discovered in the rand_core crate before 0.6.2 for Rust. Because read_u32_into and read_u64_into mishandle certain buffer-length checks a random number generator may be seeded with too little data.

Scope

1 vulnerability in this advisory, including CVE-2021-27378.

CVE-2021-27378

9.8 (Critical)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Fixed: 2 products Known affected: 2 products Known not affected: 1 product

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

OPENSUSE-SU-2024:11751-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2026-09-20 20:24

Summary

afterburn-5.0.0-6.1 on GA media

Severity

Moderate

Scope

7 vulnerabilities in this advisory, including CVE-2021-27378.

CVE-2021-27378

9.8 (Critical)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Recommended: 8 products

Open the full advisory

RUSTSEC-2021-0023 (CVE-2021-27378)

Vulnerability from osv_rustsec – Published: 2021-02-12 12:00 – Updated: 2023-06-13 13:10 – Source website

Summary

Incorrect check on buffer length when seeding RNGs

Details

Summary: rand_core::le::read_u32_into and read_u64_into have incorrect checks on the source buffer length, allowing the destination buffer to be under-filled.

Implications: some downstream RNGs, including Hc128Rng (but not the more widely used ChaCha*Rng), allow seeding using the SeedableRng::from_seed trait-function with too short keys.

Severity

9.8 (Critical)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

URL

Type

	https://crates.io/crates/rand_core	PACKAGE
	https://rustsec.org/advisories/RUSTSEC-2021-0023.html	ADVISORY
	https://github.com/rust-random/rand/pull/1096	WEB

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "crypto-failure"
        ],
        "cvss": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "rand_core::le::read_u32_into",
            "rand_core::le::read_u64_into"
          ],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "rand_core",
        "purl": "pkg:cargo/rand_core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.6.0"
            },
            {
              "fixed": "0.6.2"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2021-27378",
    "GHSA-w7j2-35mf-95p7"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "Summary: rand_core::le::read_u32_into and read_u64_into have incorrect checks on the source buffer length, allowing the destination buffer to be under-filled.\n\nImplications: some downstream RNGs, including Hc128Rng (but not the more widely used ChaCha*Rng), allow seeding using the SeedableRng::from_seed trait-function with too short keys.",
  "id": "RUSTSEC-2021-0023",
  "modified": "2023-06-13T13:10:24Z",
  "published": "2021-02-12T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/rand_core"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0023.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-random/rand/pull/1096"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Incorrect check on buffer length when seeding RNGs"
}

UBUNTU-CVE-2021-27378 (CVE-2021-27378)

Vulnerability from osv_ubuntu – Published: 2021-02-18 04:15 – Updated: 2026-05-20 14:53 – Source website

Details

Severity

9.8 (Critical)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-27378	REPORT
	https://rustsec.org/advisories/RUSTSEC-2021-0023.html	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-27378	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-rand-core+getrandom-dev",
            "binary_version": "0.5.1-1"
          },
          {
            "binary_name": "librust-rand-core+serde-dev",
            "binary_version": "0.5.1-1"
          },
          {
            "binary_name": "librust-rand-core+std-dev",
            "binary_version": "0.5.1-1"
          },
          {
            "binary_name": "librust-rand-core-dev",
            "binary_version": "0.5.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "rust-rand-core",
        "purl": "pkg:deb/ubuntu/rust-rand-core@0.5.1-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.3.0-1",
        "0.5.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-rand-core+getrandom-dev",
            "binary_version": "0.6.3-2"
          },
          {
            "binary_name": "librust-rand-core+serde-dev",
            "binary_version": "0.6.3-2"
          },
          {
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            "binary_version": "0.6.3-2"
          },
          {
            "binary_name": "librust-rand-core-dev",
            "binary_version": "0.6.3-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "rust-rand-core",
        "purl": "pkg:deb/ubuntu/rust-rand-core@0.6.3-2?arch=source\u0026distro=jammy"
      },
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          "events": [
            {
              "introduced": "0"
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          ],
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            "binary_version": "0.6.4-1"
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            "binary_version": "0.6.4-1"
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          {
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            "binary_version": "0.6.4-1"
          },
          {
            "binary_name": "librust-rand-core-dev",
            "binary_version": "0.6.4-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "rust-rand-core",
        "purl": "pkg:deb/ubuntu/rust-rand-core@0.6.4-1?arch=source\u0026distro=noble"
      },
      "ranges": [
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            {
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        "0.6.4-1"
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      "ecosystem_specific": {
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          {
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            "binary_version": "0.6.4-2"
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      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "rust-rand-core",
        "purl": "pkg:deb/ubuntu/rust-rand-core@0.6.4-2?arch=source\u0026distro=questing"
      },
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            "binary_version": "0.6.4-2"
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  ],
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  "details": "An issue was discovered in the rand_core crate before 0.6.2 for Rust. Because read_u32_into and read_u64_into mishandle certain buffer-length checks, a random number generator may be seeded with too little data.",
  "id": "UBUNTU-CVE-2021-27378",
  "modified": "2026-05-20T14:53:12Z",
  "published": "2021-02-18T04:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-27378"
    },
    {
      "type": "REPORT",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0023.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-27378"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-27378"
  ]
}

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.

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.

Action not permitted

CVE-2021-27378 (GCVE-0-2021-27378)

FKIE_CVE-2021-27378

GHSA-W7J2-35MF-95P7

GSD-2021-27378

MSRC_CVE-2021-27378

OPENSUSE-SU-2024:11751-1

RUSTSEC-2021-0023 (CVE-2021-27378)

UBUNTU-CVE-2021-27378 (CVE-2021-27378)

Tags

Sightings

Nomenclature

Related by attack behaviour