CVE-2021-36088

View on CVE.org

Published Jul 1, 2021 CVSS 3.1 · 9.8 Critical EPSS 2.4% KEV · Not listed

Description

Fluent Bit (aka fluent-bit) 1.7.0 through 1.7.4 has a double free in flb_free (called from flb_parser_json_do and flb_parser_do).

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

n/a

n/a

affected

Version	Status	Constraints
`n/a`	affected	—

Configuration 1 [-]

cpe:2.3:a:treasuredata:fluent_bit:*:*:*:*:*:*:*:*

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-2021-22721	Fluent Bit (aka fluent-bit) 1.7.0 through 1.7.4 has a double free in flb_free (called from flb_parser_json_do and flb_parser_do).

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

Exploit prediction score: 2.4% (2.384% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact total

References

Link	Providers
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33750
https://github.com/fluent/fluent-bit/commit/22346a74c07ceb90296be872be2d53eb92252a54
https://github.com/fluent/fluent-bit/pull/3453
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/fluent-bit/OSV-2021-702.yaml

History

Feb 25, 2026 1:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Subscriptions

Treasuredata Fluent Bit

Weaknesses

CWE-415
Double Free

Sources

CVE record Updated: Aug 4, 2024, 12:47 AM

Status: PUBLISHED
Assigner: mitre
Published: Jul 1, 2021, 2:50 AM
Updated: Aug 4, 2024, 12:47 AM
Reserved: Jul 1, 2021, 12:00 AM

View source JSON

Vulnrichment Updated: Aug 4, 2024, 12:47 AM

Updated: Aug 4, 2024, 12:47 AM

NVD Updated: Jun 17, 2026, 3:58 AM

Status: Modified
Published: Jul 1, 2021, 3:15 AM
Modified: Jun 17, 2026, 3:58 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2021-36088", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2024-08-04T00:47:43.818Z", "dateReserved": "2021-07-01T00:00:00.000Z", "datePublished": "2021-07-01T02:50:19.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2024-05-23T15:30:01.721Z"}, "descriptions": [{"lang": "en", "value": "Fluent Bit (aka fluent-bit) 1.7.0 through 1.7.4 has a double free in flb_free (called from flb_parser_json_do and flb_parser_do)."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33750"}, {"url": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/fluent-bit/OSV-2021-702.yaml"}, {"url": "https://github.com/fluent/fluent-bit/commit/22346a74c07ceb90296be872be2d53eb92252a54"}, {"url": "https://github.com/fluent/fluent-bit/pull/3453"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2021-36088", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2024-05-23T19:48:54.492614Z"}}}], "affected": [{"cpes": ["cpe:2.3:a:treasuredata:fluent_bit:*:*:*:*:*:*:*:*"], "vendor": "treasuredata", "product": "fluent_bit", "versions": [{"status": "affected", "version": "1.7.0", "versionType": "custom", "lessThanOrEqual": "1.7.4"}], "defaultStatus": "unknown"}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-415", "description": "CWE-415 Double Free"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:13:18.711Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T00:47:43.818Z"}, "title": "CVE Program Container", "references": [{"url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33750", "tags": ["x_transferred"]}, {"url": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/fluent-bit/OSV-2021-702.yaml", "tags": ["x_transferred"]}, {"url": "https://github.com/fluent/fluent-bit/commit/22346a74c07ceb90296be872be2d53eb92252a54", "tags": ["x_transferred"]}, {"url": "https://github.com/fluent/fluent-bit/pull/3453", "tags": ["x_transferred"]}]}]}, "dataVersion": "5.1"}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33750", "tags": ["x_transferred"]}, {"url": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/fluent-bit/OSV-2021-702.yaml", "tags": ["x_transferred"]}, {"url": "https://github.com/fluent/fluent-bit/commit/22346a74c07ceb90296be872be2d53eb92252a54", "tags": ["x_transferred"]}, {"url": "https://github.com/fluent/fluent-bit/pull/3453", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T00:47:43.818Z"}}, {"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2021-36088", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2024-05-23T19:48:54.492614Z"}}}], "affected": [{"cpes": ["cpe:2.3:a:treasuredata:fluent_bit:*:*:*:*:*:*:*:*"], "vendor": "treasuredata", "product": "fluent_bit", "versions": [{"status": "affected", "version": "1.7.0", "versionType": "custom", "lessThanOrEqual": "1.7.4"}], "defaultStatus": "unknown"}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-415", "description": "CWE-415 Double Free"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-05-23T19:55:28.929Z"}, "title": "CISA ADP Vulnrichment"}], "cna": {"affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "references": [{"url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33750"}, {"url": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/fluent-bit/OSV-2021-702.yaml"}, {"url": "https://github.com/fluent/fluent-bit/commit/22346a74c07ceb90296be872be2d53eb92252a54"}, {"url": "https://github.com/fluent/fluent-bit/pull/3453"}], "descriptions": [{"lang": "en", "value": "Fluent Bit (aka fluent-bit) 1.7.0 through 1.7.4 has a double free in flb_free (called from flb_parser_json_do and flb_parser_do)."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "text", "description": "n/a"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2024-05-23T15:30:01.721Z"}}}, "cveMetadata": {"cveId": "CVE-2021-36088", "state": "PUBLISHED", "dateUpdated": "2024-08-04T00:47:43.818Z", "dateReserved": "2021-07-01T00:00:00.000Z", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "datePublished": "2021-07-01T02:50:19.000Z", "assignerShortName": "mitre"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}, {"affectedData": [{"cpes": ["cpe:2.3:a:treasuredata:fluent_bit:*:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "fluent_bit", "vendor": "treasuredata", "versions": [{"lessThanOrEqual": "1.7.4", "status": "affected", "version": "1.7.0", "versionType": "custom"}]}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:treasuredata:fluent_bit:*:*:*:*:*:*:*:*", "matchCriteriaId": "ADC73357-2D28-4021-AEF7-0CB5CE9D9011", "versionEndIncluding": "1.7.4", "versionStartIncluding": "1.7.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Fluent Bit (aka fluent-bit) 1.7.0 through 1.7.4 has a double free in flb_free (called from flb_parser_json_do and flb_parser_do)."}, {"lang": "es", "value": "Fluent Bit (tambi\u00e9n se conoce como fluent-bit) versiones 1.7.0 hasta 1.7,4 presenta una doble liberaci\u00f3n en la funci\u00f3n flb_free (llamado desde flb_parser_json_do y flb_parser_do)"}], "id": "CVE-2021-36088", "lastModified": "2026-06-17T03:58:21.140", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 7.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-36088", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2024-05-23T19:48:54.492614Z", "version": "2.0.3"}}]}, "published": "2021-07-01T03:15:08.847", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Patch", "Third Party Advisory"], "url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33750"}, {"source": "cve@mitre.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/fluent/fluent-bit/commit/22346a74c07ceb90296be872be2d53eb92252a54"}, {"source": "cve@mitre.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/fluent/fluent-bit/pull/3453"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/fluent-bit/OSV-2021-702.yaml"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Patch", "Third Party Advisory"], "url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33750"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/fluent/fluent-bit/commit/22346a74c07ceb90296be872be2d53eb92252a54"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/fluent/fluent-bit/pull/3453"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/fluent-bit/OSV-2021-702.yaml"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-415"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}