CVE-2021-4188

NULL Pointer Dereference in mruby/mruby

View on CVE.org

Published Dec 30, 2021 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Description

mruby is vulnerable to NULL Pointer Dereference

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

mruby

mruby/mruby

affected

Version	Status	Constraints
`unspecified`	affected	< 3.1

Configuration 1 [-]

cpe:2.3:a:mruby:mruby:*:*:*:*:*:*:*:*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
EUVD	EUVD-2021-34048	mruby is vulnerable to NULL Pointer Dereference

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact High

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.884% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://github.com/mruby/mruby/commit/27d1e0132a0804581dca28df042e7047fd27eaa8
https://huntr.dev/bounties/78533fb9-f3e0-47c2-86dc-d1f96d5bea28

History

No history.

Subscriptions

Mruby Mruby

Weaknesses

CWE-476

Sources

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

Status: PUBLISHED
Assigner: @huntrdev
Published: Dec 30, 2021, 6:55 AM
Updated: Aug 3, 2024, 5:16 PM
Reserved: Dec 29, 2021, 12:00 AM

View source JSON

Vulnrichment No data

No data.

NVD Updated: Jun 17, 2026, 4:19 AM

Status: Modified
Published: Dec 30, 2021, 7:15 AM
Modified: Jun 17, 2026, 4:19 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

{"containers": {"cna": {"affected": [{"product": "mruby/mruby", "vendor": "mruby", "versions": [{"lessThan": "3.1", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "mruby is vulnerable to NULL Pointer Dereference"}], "metrics": [{"cvssV3_0": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "version": "3.0"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-476", "description": "CWE-476 NULL Pointer Dereference", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-12-30T06:55:09.000Z", "orgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "shortName": "@huntrdev"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://huntr.dev/bounties/78533fb9-f3e0-47c2-86dc-d1f96d5bea28"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/mruby/mruby/commit/27d1e0132a0804581dca28df042e7047fd27eaa8"}], "source": {"advisory": "78533fb9-f3e0-47c2-86dc-d1f96d5bea28", "discovery": "EXTERNAL"}, "title": "NULL Pointer Dereference in mruby/mruby", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@huntr.dev", "ID": "CVE-2021-4188", "STATE": "PUBLIC", "TITLE": "NULL Pointer Dereference in mruby/mruby"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "mruby/mruby", "version": {"version_data": [{"version_affected": "<", "version_value": "3.1"}]}}]}, "vendor_name": "mruby"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "mruby is vulnerable to NULL Pointer Dereference"}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "version": "3.0"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-476 NULL Pointer Dereference"}]}]}, "references": {"reference_data": [{"name": "https://huntr.dev/bounties/78533fb9-f3e0-47c2-86dc-d1f96d5bea28", "refsource": "CONFIRM", "url": "https://huntr.dev/bounties/78533fb9-f3e0-47c2-86dc-d1f96d5bea28"}, {"name": "https://github.com/mruby/mruby/commit/27d1e0132a0804581dca28df042e7047fd27eaa8", "refsource": "MISC", "url": "https://github.com/mruby/mruby/commit/27d1e0132a0804581dca28df042e7047fd27eaa8"}]}, "source": {"advisory": "78533fb9-f3e0-47c2-86dc-d1f96d5bea28", "discovery": "EXTERNAL"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:16:04.248Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://huntr.dev/bounties/78533fb9-f3e0-47c2-86dc-d1f96d5bea28"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/mruby/mruby/commit/27d1e0132a0804581dca28df042e7047fd27eaa8"}]}]}, "cveMetadata": {"assignerOrgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "assignerShortName": "@huntrdev", "cveId": "CVE-2021-4188", "datePublished": "2021-12-30T06:55:09.000Z", "dateReserved": "2021-12-29T00:00:00.000Z", "dateUpdated": "2024-08-03T17:16:04.248Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"product": "mruby/mruby", "vendor": "mruby", "versions": [{"lessThan": "3.1", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@huntr.dev"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mruby:mruby:*:*:*:*:*:*:*:*", "matchCriteriaId": "E65F5997-52F0-4937-AFA2-D56A5DACBD6C", "versionEndIncluding": "3.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "mruby is vulnerable to NULL Pointer Dereference"}, {"lang": "es", "value": "mruby es vulnerable a la desviaci\u00f3n de puntero nulo\n"}], "id": "CVE-2021-4188", "lastModified": "2026-06-17T04:19:11.027", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "version": "3.0"}, "exploitabilityScore": 2.5, "impactScore": 4.2, "source": "security@huntr.dev", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-12-30T07:15:06.527", "references": [{"source": "security@huntr.dev", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/mruby/mruby/commit/27d1e0132a0804581dca28df042e7047fd27eaa8"}, {"source": "security@huntr.dev", "tags": ["Exploit", "Patch", "Third Party Advisory"], "url": "https://huntr.dev/bounties/78533fb9-f3e0-47c2-86dc-d1f96d5bea28"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/mruby/mruby/commit/27d1e0132a0804581dca28df042e7047fd27eaa8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Patch", "Third Party Advisory"], "url": "https://huntr.dev/bounties/78533fb9-f3e0-47c2-86dc-d1f96d5bea28"}], "sourceIdentifier": "security@huntr.dev", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "security@huntr.dev", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}