Vulnerability-Lookup

CVE-2021-33796 (GCVE-0-2021-33796)

Vulnerability from cvelistv5 – Published: 2023-07-07 17:55 – Updated: 2024-11-12 19:49

Summary

In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.

Severity

10 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-11-12 19:48 UTC

CWE

CWE-416 - Use After Free

Assigner

fedora redhat root

References

1 reference

URL	Tags
https://github.com/ccxvii/mujs/commit/7ef066a3bb9…

Impacted products

1 product

Vendor	Product	Version	CPE status
MuJS	MuJS	Affected: 1.1.1 , ≤ all (rpm)	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2021-33796

Vulnerability from fkie_nvd - Published: 2023-07-07 18:15 - Updated: 2026-06-17 03:55

Severity

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

Summary

In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.

References

	URL	Tags
	patrick@puiterwijk.org	https://github.com/ccxvii/mujs/commit/7ef066a3bb95bf83e7c5be50d859e62e58fe8515	Patch
	af854a3a-2127-422b-91ae-364da2661108	https://github.com/ccxvii/mujs/commit/7ef066a3bb95bf83e7c5be50d859e62e58fe8515	Patch

Impacted products

	Vendor	Product	Version
	artifex	mujs	*

JSON

To clipboard

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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/ccxvii/mujs/commit/7ef066a3bb95bf83e7c5be50d859e62e58fe8515"
    }
  ],
  "sourceIdentifier": "patrick@puiterwijk.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "patrick@puiterwijk.org",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-PC6C-FW6Q-CFHJ

Vulnerability from github – Published: 2023-07-07 18:30 – Updated: 2024-04-04 05:50

Details

In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.

Severity

10.0 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2021-33796"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-07-07T18:15:09Z",
    "severity": "HIGH"
  },
  "details": "In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.\n\n",
  "id": "GHSA-pc6c-fw6q-cfhj",
  "modified": "2024-04-04T05:50:47Z",
  "published": "2023-07-07T18:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-33796"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ccxvii/mujs/commit/7ef066a3bb95bf83e7c5be50d859e62e58fe8515"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GSD-2021-33796

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

Details

In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.

Aliases

CVE-2021-33796

Aliases

CVE-2021-33796

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-33796",
    "id": "GSD-2021-33796"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-33796"
      ],
      "details": "In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.\n\n",
      "id": "GSD-2021-33796",
      "modified": "2023-12-13T01:23:18.803148Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "ASSIGNER": "patrick@puiterwijk.org",
        "ID": "CVE-2021-33796",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "MuJS",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c=",
                          "version_name": "1.1.1",
                          "version_value": "all"
                        }
                      ]
                    }
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              },
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            }
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      },
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
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                "value": "CWE-416 Use After Free"
              }
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        ]
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          {
            "name": "https://github.com/ccxvii/mujs/commit/7ef066a3bb95bf83e7c5be50d859e62e58fe8515",
            "refsource": "MISC",
            "url": "https://github.com/ccxvii/mujs/commit/7ef066a3bb95bf83e7c5be50d859e62e58fe8515"
          }
        ]
      },
      "source": {
        "discovery": "UNKNOWN"
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    "nvd.nist.gov": {
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                "cpe_name": [],
                "versionEndExcluding": "1.1.2",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
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          "ASSIGNER": "patrick@puiterwijk.org",
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            "version": "3.1"
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      "publishedDate": "2023-07-07T18:15Z"
    }
  }
}

UBUNTU-CVE-2021-33796 (CVE-2021-33796)

Vulnerability from osv_ubuntu – Published: 2023-07-07 18:15 – Updated: 2025-07-16 04:57 – Source website

Withdrawn 2025-07-18

Details

In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.

Severity

7.5 (High)


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

10.0 (Critical)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-33796	REPORT
	https://github.com/ccxvii/mujs/commit/7ef066a3bb9…	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-33796	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libmujs-dev",
            "binary_version": "1.1.3-3"
          },
          {
            "binary_name": "libmujs1",
            "binary_version": "1.1.3-3"
          },
          {
            "binary_name": "libmujs1-dbgsym",
            "binary_version": "1.1.3-3"
          },
          {
            "binary_name": "mujs",
            "binary_version": "1.1.3-3"
          },
          {
            "binary_name": "mujs-dbgsym",
            "binary_version": "1.1.3-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "mujs",
        "purl": "pkg:deb/ubuntu/mujs@1.1.3-3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.1.3-3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.0-1",
        "1.1.3-2"
      ]
    }
  ],
  "aliases": [],
  "details": "In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.",
  "id": "UBUNTU-CVE-2021-33796",
  "modified": "2025-07-16T04:57:20Z",
  "published": "2023-07-07T18:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-33796"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/ccxvii/mujs/commit/7ef066a3bb95bf83e7c5be50d859e62e58fe8515"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-33796"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-33796"
  ],
  "withdrawn": "2025-07-18T16:46:52Z"
}

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.

Action not permitted

CVE-2021-33796 (GCVE-0-2021-33796)

FKIE_CVE-2021-33796

GHSA-PC6C-FW6Q-CFHJ

GSD-2021-33796

UBUNTU-CVE-2021-33796 (CVE-2021-33796)

Tags

Sightings

Nomenclature

Related by attack behaviour