Vulnerability-Lookup

osv-2021-1672

Vulnerability from osv_ossfuzz

Published

2021-12-12 00:01

Modified

2026-09-10 14:13

Summary

Heap-buffer-overflow in blosc_d

Details

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=42210

Crash type: Heap-buffer-overflow READ 4
Crash state:
blosc_d
do_job
blosc_run_decompression_with_context

References

URL

Type

https://bugs.chromium.org/p/oss-fuzz/issues/detai…

REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "severity": "MEDIUM"
      },
      "package": {
        "ecosystem": "OSS-Fuzz",
        "name": "c-blosc2",
        "purl": "pkg:generic/c-blosc2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4a727370b1c2e9746434c00bf2236db86c31ea5c"
            }
          ],
          "repo": "https://github.com/Blosc/c-blosc2.git",
          "type": "GIT"
        }
      ],
      "versions": [
        "v2.0.0",
        "v2.0.0-rc2",
        "v2.0.0.rc1",
        "v2.0.1",
        "v2.0.2",
        "v2.0.3",
        "v2.0.4",
        "v2.1.0",
        "v2.1.1",
        "v2.2.0",
        "v2.3.0",
        "v2.3.1",
        "v2.4.0",
        "v2.4.1",
        "v2.4.2",
        "v2.4.3",
        "v2.5.0",
        "v2.6.0",
        "v2.6.1",
        "v2.7.0",
        "v2.7.1",
        "v2.8.0",
        "v2.9.0",
        "v2.9.1",
        "v2.9.2",
        "v2.9.3",
        "v2.10.0",
        "v2.10.1",
        "v2.10.2",
        "v2.10.3",
        "v2.10.4",
        "v2.10.5",
        "v2.11.0",
        "v2.11.1",
        "v2.11.2",
        "v2.11.3",
        "v2.12.0",
        "v2.13.0",
        "v2.13.1",
        "v2.13.2",
        "v2.14.0",
        "v2.14.1",
        "v2.14.2",
        "v2.14.3",
        "v2.14.4",
        "v2.15.0",
        "v2.15.1",
        "v2.15.2",
        "v2.16.0",
        "v2.17.0",
        "v2.17.1",
        "v2.18.0",
        "v2.19.0",
        "v2.19.1",
        "v2.20.0",
        "v2.21.0",
        "v2.21.1",
        "v2.21.2",
        "v2.21.3",
        "v2.22.0",
        "v2.23.0",
        "v2.23.1",
        "v3.0.0.rc1",
        "v3.0.0.rc2",
        "v3.0.0",
        "v3.0.1",
        "v3.0.2",
        "v3.0.3",
        "v3.1.0",
        "v3.1.1",
        "v3.1.2",
        "v3.1.3",
        "v3.1.4",
        "v3.1.5",
        "v3.2.0",
        "v3.2.1",
        "v3.2.2",
        "v3.2.3",
        "v3.3.0",
        "v3.3.1",
        "v3.3.2",
        "v3.3.3",
        "v3.3.4"
      ]
    }
  ],
  "details": "OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=42210\n\n```\nCrash type: Heap-buffer-overflow READ 4\nCrash state:\nblosc_d\ndo_job\nblosc_run_decompression_with_context\n```\n",
  "id": "OSV-2021-1672",
  "modified": "2026-09-10T14:13:49.573388Z",
  "published": "2021-12-12T00:01:29.747137Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=42210"
    }
  ],
  "schema_version": "1.2.0",
  "summary": "Heap-buffer-overflow in blosc_d"
}

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.

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.