CVE-2021-4070

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

View on CVE.org

Published Feb 23, 2022 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed

Description

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

Analysis

No analysis available yet

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

v2fly

v2fly/v2ray-core

affected

Version	Status	Constraints
`unspecified`	affected	< 4.44.0

Configuration 1 [-]

cpe:2.3:a:v2fly:v2ray-core:*:*:*:*:*:*:*:*

No data.

No data available yet.

Remediation

No remediation available yet

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
EUVD	EUVD-2022-0809	Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.
Github GHSA	GHSA-4cxw-hq44-r344	Off-by-one Error in v2fly/v2ray-core

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact High

User Interaction None

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.858% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c
https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877

History

No history.

Subscriptions

V2fly V2ray-core

Weaknesses

CWE-193
Off-by-one Error

Sources

CVE record Updated: Aug 3, 2024, 5:16 PM

Status: PUBLISHED
Assigner: @huntrdev
Published: Feb 23, 2022, 7:50 PM
Updated: Aug 3, 2024, 5:16 PM
Reserved: Dec 5, 2021, 12:00 AM

View source JSON

Vulnrichment No data

No data.

NVD Updated: Jun 17, 2026, 4:18 AM

Status: Modified
Published: Feb 23, 2022, 8:15 PM
Modified: Jun 17, 2026, 4:18 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

{"containers": {"cna": {"affected": [{"product": "v2fly/v2ray-core", "vendor": "v2fly", "versions": [{"lessThan": "4.44.0", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0."}], "metrics": [{"cvssV3_0": {"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"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-193", "description": "CWE-193 Off-by-one Error", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2022-02-23T19:50:10.000Z", "orgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "shortName": "@huntrdev"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c"}], "source": {"advisory": "8da19456-4d89-41ef-9781-a41efd6a1877", "discovery": "EXTERNAL"}, "title": "Off-by-one Error in v2fly/v2ray-core", "x_legacyV4Record": {"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": "<", "version_value": "4.44.0"}]}}]}, "vendor_name": "v2fly"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "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"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:16:03.674Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c"}]}]}, "cveMetadata": {"assignerOrgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "assignerShortName": "@huntrdev", "cveId": "CVE-2021-4070", "datePublished": "2022-02-23T19:50:10.000Z", "dateReserved": "2021-12-05T00:00:00.000Z", "dateUpdated": "2024-08-03T17:16:03.674Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"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"}, "exploitabilityScore": 2.5, "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", "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, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2022-02-23T20:15:09.167", "references": [{"source": "security@huntr.dev", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c"}, {"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"], "url": "https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Patch", "Third Party Advisory"], "url": "https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877"}], "sourceIdentifier": "security@huntr.dev", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-193"}], "source": "security@huntr.dev", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-193"}], "source": "nvd@nist.gov", "type": "Primary"}]}