CVE-2021-28166

View on CVE.org

Published Apr 7, 2021 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Description

In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur.

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

The Eclipse Foundation

Eclipse Mosquitto

affected

Version	Status	Constraints
`2.0`	affected	< unspecified
`unspecified`	affected	≤ 2.0.9

Configuration 1 [-]

cpe:2.3:a:eclipse:mosquitto:*:*:*:*:*:*:*:*

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-2021-14859	In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication Single

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.968% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://bugs.eclipse.org/bugs/show_bug.cgi?id=572608

History

No history.

Subscriptions

Eclipse Mosquitto

Weaknesses

CWE-476

Sources

CVE record Updated: Aug 3, 2024, 9:40 PM

Status: PUBLISHED
Assigner: eclipse
Published: Apr 7, 2021, 6:50 PM
Updated: Aug 3, 2024, 9:40 PM
Reserved: Mar 12, 2021, 12:00 AM

View source JSON

Vulnrichment No data

No data.

NVD Updated: Jun 17, 2026, 3:45 AM

Status: Modified
Published: Apr 7, 2021, 7:15 PM
Modified: Jun 17, 2026, 3:45 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

{"containers": {"cna": {"affected": [{"product": "Eclipse Mosquitto", "vendor": "The Eclipse Foundation", "versions": [{"lessThan": "unspecified", "status": "affected", "version": "2.0", "versionType": "custom"}, {"lessThanOrEqual": "2.0.9", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "exploitCodeMaturity": "FUNCTIONAL", "integrityImpact": "NONE", "privilegesRequired": "LOW", "remediationLevel": "OFFICIAL_FIX", "reportConfidence": "CONFIRMED", "scope": "UNCHANGED", "temporalScore": 6, "temporalSeverity": "MEDIUM", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:F/RL:O/RC:C", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-476", "description": "CWE-476: NULL Pointer Dereference", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-04-07T18:50:19.000Z", "orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c", "shortName": "eclipse"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=572608"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@eclipse.org", "ID": "CVE-2021-28166", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Eclipse Mosquitto", "version": {"version_data": [{"version_affected": ">=", "version_value": "2.0"}, {"version_affected": "<=", "version_value": "2.0.9"}]}}]}, "vendor_name": "The Eclipse Foundation"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur."}]}, "impact": {"cvss": {"baseScore": 6, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:F/RL:O/RC:C", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-476: NULL Pointer Dereference"}]}]}, "references": {"reference_data": [{"name": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=572608", "refsource": "CONFIRM", "url": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=572608"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T21:40:12.058Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=572608"}]}]}, "cveMetadata": {"assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c", "assignerShortName": "eclipse", "cveId": "CVE-2021-28166", "datePublished": "2021-04-07T18:50:19.000Z", "dateReserved": "2021-03-12T00:00:00.000Z", "dateUpdated": "2024-08-03T21:40:12.058Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"product": "Eclipse Mosquitto", "vendor": "The Eclipse Foundation", "versions": [{"lessThan": "unspecified", "status": "affected", "version": "2.0", "versionType": "custom"}, {"lessThanOrEqual": "2.0.9", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "emo@eclipse.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:eclipse:mosquitto:*:*:*:*:*:*:*:*", "matchCriteriaId": "FB060C3C-B361-4C5A-B55E-6266FA3CED87", "versionEndIncluding": "2.0.9", "versionStartIncluding": "2.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur."}, {"lang": "es", "value": "En Eclipse Mosquitto versiones 2.0.0 hasta 2.0.9, si un cliente autenticado que se hab\u00eda conectado con MQTT v5 envi\u00f3 un mensaje CONNACK dise\u00f1ado al broker, se producir\u00eda una desreferencia del puntero NULL"}], "id": "CVE-2021-28166", "lastModified": "2026-06-17T03:45:56.200", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "PARTIAL", "baseScore": 4.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 8.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "emo@eclipse.org", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-04-07T19:15:12.347", "references": [{"source": "emo@eclipse.org", "tags": ["Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=572608"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=572608"}], "sourceIdentifier": "emo@eclipse.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "emo@eclipse.org", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}