ubuntu-cve-2021-41496
Vulnerability from osv_ubuntu
Published
2021-12-17 20:15
Modified
2025-09-08 16:47
Summary
Details

Buffer overflow in the array_from_pyobj function of fortranobject.c in NumPy < 1.19, which allows attackers to conduct a Denial of Service attacks by carefully constructing an array with negative values. NOTE: The vendor does not agree this is a vulnerability; the negative dimensions can only be created by an already privileged user (or internally)

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python3-numpy",
            "binary_version": "1:1.17.4-5ubuntu3.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "numpy",
        "purl": "pkg:deb/ubuntu/numpy@1:1.17.4-5ubuntu3.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:1.17.4-5ubuntu3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.17.3-0ubuntu2",
        "1:1.17.4-3ubuntu1",
        "1:1.17.4-3ubuntu2",
        "1:1.17.4-5ubuntu2",
        "1:1.17.4-5ubuntu3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python3-numpy",
            "binary_version": "1:1.21.5-1ubuntu22.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "numpy",
        "purl": "pkg:deb/ubuntu/numpy@1:1.21.5-1ubuntu22.04.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:1.21.5-1ubuntu22.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.19.5-1ubuntu2",
        "1:1.19.5-1ubuntu3",
        "1:1.20.2-1ubuntu1",
        "1:1.21.4-2",
        "1:1.21.5-1",
        "1:1.21.5-1build2"
      ]
    }
  ],
  "aliases": [],
  "details": "Buffer overflow in the array_from_pyobj function of fortranobject.c in NumPy \u003c 1.19, which allows attackers to conduct a Denial of Service attacks by carefully constructing an array with negative values. NOTE: The vendor does not agree this is a vulnerability; the negative dimensions can only be created by an already privileged user (or internally)",
  "id": "UBUNTU-CVE-2021-41496",
  "modified": "2025-09-08T16:47:22Z",
  "published": "2021-12-17T20:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-41496"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/numpy/numpy/issues/19000"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/numpy/numpy/pull/20630"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/numpy/numpy/commit/271010f1037150e95017f803f4214b8861e528f2"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5763-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-41496"
    }
  ],
  "related": [
    "USN-5763-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-41496"
  ]
}



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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

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.