CVE-2021-43304 - Vulnerability Details - OpenCVE

Heap buffer overflow in Clickhouse's LZ4 compression codec when parsing a malicious query. There is no verification that the copy operations in the LZ4::decompressImpl loop and especially the arbitrary copy operation wildCopy<copy_amount>(op, ip, copy_end), don’t exceed the destination buffer’s limits.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

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 Single

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Vendors	Products
Clickhouse	Clickhouse
Debian	Debian Linux

Configuration 1 [-]

cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:*

Configuration 2 [-]

cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

No data.

References

Link	Providers
https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms
https://lists.debian.org/debian-lts-announce/2022/11/msg00002.html

History

Tue, 15 Jul 2025 13:45:00 +0000

Type	Values Removed	Values Added
Metrics	epss `{'score': 0.00174}`	epss `{'score': 0.00185}`

Wed, 25 Jun 2025 21:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		Clickhouse Clickhouse clickhouse
CPEs	cpe:2.3:a:yandex:clickhouse::::::::	cpe:2.3:a:clickhouse:clickhouse::::::::
Vendors & Products	Yandex Yandex clickhouse	Clickhouse Clickhouse clickhouse

MITRE

Status: PUBLISHED

Assigner: JFROG

Published: 2022-03-14T00:00:00

Updated: 2024-08-04T03:55:28.381Z

Reserved: 2021-11-03T00:00:00

Link: CVE-2021-43304

Vulnrichment

No data.

NVD

Status : Modified

Published: 2022-03-14T23:15:08.157

Modified: 2025-06-25T20:49:29.357

Link: CVE-2021-43304

Redhat

No data.

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:*", "matchCriteriaId": "4CD6B56E-9355-4A1F-9FF8-4FA097CF8AB4", "versionEndExcluding": "21.10.2.15", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Heap buffer overflow in Clickhouse's LZ4 compression codec when parsing a malicious query. There is no verification that the copy operations in the LZ4::decompressImpl loop and especially the arbitrary copy operation wildCopy<copy_amount>(op, ip, copy_end), don\u2019t exceed the destination buffer\u2019s limits."}, {"lang": "es", "value": "Un Desbordamiento del b\u00fafer de la pila en el c\u00f3dec de compresi\u00f3n LZ4 de Clickhouse cuando es analizada una consulta maliciosa. No es verificado que las operaciones de copia en el bucle LZ4::decompressImpl y especialmente la operaci\u00f3n de copia arbitraria wildCopy(copy_amount)(op, ip, copy_end), no excedan los l\u00edmites del buffer de destino"}], "id": "CVE-2021-43304", "lastModified": "2025-06-25T20:49:29.357", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "PARTIAL", "baseScore": 6.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 8.0, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "[email protected]", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "[email protected]", "type": "Primary"}]}, "published": "2022-03-14T23:15:08.157", "references": [{"source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"], "url": "https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms"}, {"source": "[email protected]", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/11/msg00002.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/11/msg00002.html"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "[email protected]", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "[email protected]", "type": "Primary"}]}