Vulnerability-Lookup

CVE-2021-4070 (GCVE-0-2021-4070)

Vulnerability from cvelistv5 – Published: 2022-02-23 19:50 – Updated: 2024-08-03 17:16

Title

Off-by-one Error in v2fly/v2ray-core

Summary

Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.

Severity

5.9 (Medium)


                        
                          CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CWE

CWE-193 - Off-by-one Error

Assigner

@huntrdev

References

2 references

URL	Tags
https://huntr.dev/bounties/8da19456-4d89-41ef-978…	x_refsource_CONFIRM
https://github.com/v2fly/v2ray-core/commit/c1af2b…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
v2fly	v2fly/v2ray-core	Affected: unspecified , < 4.44.0 (custom)	guessed

Show details on NVD website

JSON

To clipboard

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    "dateReserved": "2021-12-05T00:00:00.000Z",
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      "id": "CVE-2021-4070",
      "lastModified": "2024-11-21T06:36:50.743",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H\", \"baseScore\": 9.1, \"baseSeverity\": \"CRITICAL\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 5.2}], \"cvssMetricV30\": [{\"source\": \"security@huntr.dev\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.0\", \"vectorString\": \"CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L\", \"baseScore\": 5.9, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"LOW\", \"integrityImpact\": \"LOW\", \"availabilityImpact\": \"LOW\"}, \"exploitabilityScore\": 2.5, \"impactScore\": 3.4}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:L/Au:N/C:P/I:N/A:P\", \"baseScore\": 6.4, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"LOW\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"PARTIAL\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 10.0, \"impactScore\": 4.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
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    "redhat_vex": {
      "current_release_date": "2026-03-27T13:33:42+00:00",
      "cve": "CVE-2021-4070",
      "id": "CVE-2021-4070",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Off-by-one Error in v2fly/v2ray-core",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-4070.json",
      "version": "3"
    }
  }
}

FKIE_CVE-2021-4070

Vulnerability from fkie_nvd - Published: 2022-02-23 20:15 - Updated: 2026-06-17 04:18

Severity

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

Summary

Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.

References

URL	Tags
security@huntr.dev	https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c	Patch, Third Party Advisory
security@huntr.dev	https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877	Exploit, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877	Exploit, Patch, Third Party Advisory

Impacted products

	Vendor	Product	Version
	v2fly	v2ray-core	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "v2fly/v2ray-core",
          "vendor": "v2fly",
          "versions": [
            {
              "lessThan": "4.44.0",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security@huntr.dev"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:v2fly:v2ray-core:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "979DEA5F-2F1E-443A-9585-1BE8D31FEB80",
              "versionEndExcluding": "4.44.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0."
    },
    {
      "lang": "es",
      "value": "Un Error de Desv\u00edo en el repositorio de GitHub v2fly/v2ray-core versiones anteriores a 4.44.0"
    }
  ],
  "id": "CVE-2021-4070",
  "lastModified": "2026-06-17T04:18:59.397",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 6.4,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 4.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
          "version": "3.0"
        },
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        "impactScore": 3.4,
        "source": "security@huntr.dev",
        "type": "Secondary"
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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          "version": "3.1"
        },
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        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
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    ]
  },
  "published": "2022-02-23T20:15:09.167",
  "references": [
    {
      "source": "security@huntr.dev",
      "tags": [
        "Patch",
        "Third Party Advisory"
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    },
    {
      "source": "security@huntr.dev",
      "tags": [
        "Exploit",
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Patch",
        "Third Party Advisory"
      ],
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    }
  ],
  "sourceIdentifier": "security@huntr.dev",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-193"
        }
      ],
      "source": "security@huntr.dev",
      "type": "Secondary"
    },
    {
      "description": [
        {
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}

GHSA-4CXW-HQ44-R344

Vulnerability from github – Published: 2022-02-24 00:00 – Updated: 2022-03-03 19:17

Summary

Off-by-one Error in v2fly/v2ray-core

Details

v2fly/v2ray-core prior to 4.44.0 is vulnerable to an off-by-one error. Indexing operations on arrays, slices, or strings should use an index at most one less than the length. If the index is checked for being less than or equal to the length (<=), instead of less than the length (<), the index could be out of bounds.

Severity

9.1 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/v2fly/v2ray-core/v4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.44.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 4.44.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/v2fly/v2ray-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-4070"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-193"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-02-24T20:44:31Z",
    "nvd_published_at": "2022-02-23T20:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "v2fly/v2ray-core prior to 4.44.0 is vulnerable to an off-by-one error. Indexing operations on arrays, slices, or strings should use an index at most one less than the length. If the index is checked for being less than or equal to the length (`\u003c=`), instead of less than the length (`\u003c`), the index could be out of bounds.",
  "id": "GHSA-4cxw-hq44-r344",
  "modified": "2022-03-03T19:17:50Z",
  "published": "2022-02-24T00:00:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-4070"
    },
    {
      "type": "WEB",
      "url": "https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/v2fly/v2ray-core"
    },
    {
      "type": "WEB",
      "url": "https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Off-by-one Error in v2fly/v2ray-core"
}

GSD-2021-4070

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

Details

Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.

Aliases

CVE-2021-4070

Aliases

CVE-2021-4070

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-4070",
    "description": "Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.",
    "id": "GSD-2021-4070"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-4070"
      ],
      "details": "Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.",
      "id": "GSD-2021-4070",
      "modified": "2023-12-13T01:23:11.781095Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security@huntr.dev",
        "ID": "CVE-2021-4070",
        "STATE": "PUBLIC",
        "TITLE": "Off-by-one Error in v2fly/v2ray-core"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "v2fly/v2ray-core",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_value": "4.44.0"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "v2fly"
            }
          ]
        }
      },
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      "description": {
        "description_data": [
          {
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            "value": "Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0."
          }
        ]
      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
          "version": "3.0"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-193 Off-by-one Error"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877",
            "refsource": "CONFIRM",
            "url": "https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877"
          },
          {
            "name": "https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c",
            "refsource": "MISC",
            "url": "https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c"
          }
        ]
      },
      "source": {
        "advisory": "8da19456-4d89-41ef-9781-a41efd6a1877",
        "discovery": "EXTERNAL"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003cv4.44.0",
          "affected_versions": "All versions before 4.44.0",
          "cvss_v2": "AV:N/AC:L/Au:N/C:P/I:N/A:P",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "cwe_ids": [
            "CWE-1035",
            "CWE-193",
            "CWE-937"
          ],
          "date": "2022-03-02",
          "description": "Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.",
          "fixed_versions": [
            "v4.44.0"
          ],
          "identifier": "CVE-2021-4070",
          "identifiers": [
            "CVE-2021-4070",
            "GHSA-4cxw-hq44-r344"
          ],
          "not_impacted": "",
          "package_slug": "go/github.com/v2fly/v2ray-core",
          "pubdate": "2022-02-23",
          "solution": "Upgrade to version 4.44.0 or above.",
          "title": "Off-by-one Error in v2fly/v2ray-core",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2021-4070",
            "https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c",
            "https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877",
            "https://github.com/advisories/GHSA-4cxw-hq44-r344"
          ],
          "uuid": "b2121326-fe5e-4bf7-b0c6-8dfec4a4d4b1",
          "versions": [
            {
              "commit": {
                "sha": "9936afaa49b515fd5ecd9c8968f7c792bd67ae05",
                "tags": [
                  "v4.44.0"
                ],
                "timestamp": "20211205192741"
              },
              "number": "v4.44.0"
            }
          ]
        },
        {
          "affected_range": "\u003cv4.44.0",
          "affected_versions": "All versions before 4.44.0",
          "cwe_ids": [
            "CWE-1035",
            "CWE-937"
          ],
          "date": "2022-02-26",
          "description": "Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.",
          "fixed_versions": [
            "v4.44.0"
          ],
          "identifier": "CVE-2021-4070",
          "identifiers": [
            "GHSA-4cxw-hq44-r344",
            "CVE-2021-4070"
          ],
          "not_impacted": "All versions starting from 4.44.0",
          "package_slug": "go/github.com/v2fly/v2ray-core/v4",
          "pubdate": "2022-02-24",
          "solution": "Upgrade to version 4.44.0 or above.",
          "title": "Off-by-one Error in v2fly/v2ray-core",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2021-4070",
            "https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c",
            "https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877",
            "https://github.com/advisories/GHSA-4cxw-hq44-r344"
          ],
          "uuid": "c0d00ec4-9a66-48c9-9d53-807678508126",
          "versions": [
            {
              "commit": {
                "sha": "9936afaa49b515fd5ecd9c8968f7c792bd67ae05",
                "tags": [
                  "v4.44.0"
                ],
                "timestamp": "20211205192741"
              },
              "number": "v4.44.0"
            }
          ]
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:v2fly:v2ray-core:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "4.44.0",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "security@huntr.dev",
          "ID": "CVE-2021-4070"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-193"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877",
              "refsource": "CONFIRM",
              "tags": [
                "Exploit",
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877"
            },
            {
              "name": "https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c",
              "refsource": "MISC",
              "tags": [
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 6.4,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 4.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.2
        }
      },
      "lastModifiedDate": "2022-03-02T17:33Z",
      "publishedDate": "2022-02-23T20:15Z"
    }
  }
}

ubuntu-cve-2021-4070

Vulnerability from osv_ubuntu

Published

2022-02-23 20:15

Modified

2025-09-08 16:46

Summary

Details

Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.

Severity

5.9 (Medium)


                    
                      CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

9.1 (Critical)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-4070	REPORT
	https://huntr.dev/bounties/8da19456-4d89-41ef-978…	REPORT
	https://github.com/v2fly/v2ray-core/commit/c1af2b…	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-4070	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-v2ray-core-dev",
            "binary_version": "4.34.0-5"
          },
          {
            "binary_name": "v2ray",
            "binary_version": "4.34.0-5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "golang-v2ray-core",
        "purl": "pkg:deb/ubuntu/golang-v2ray-core@4.34.0-5?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.34.0-1",
        "4.34.0-5"
      ]
    }
  ],
  "aliases": [],
  "details": "Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.",
  "id": "UBUNTU-CVE-2021-4070",
  "modified": "2025-09-08T16:46:51Z",
  "published": "2022-02-23T20:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-4070"
    },
    {
      "type": "REPORT",
      "url": "https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877/"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-4070"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-4070"
  ]
}

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-2021-4070 (GCVE-0-2021-4070)

FKIE_CVE-2021-4070

GHSA-4CXW-HQ44-R344

GSD-2021-4070

ubuntu-cve-2021-4070

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour