{"cve":"CVE-2021-43304","nvd":{"published":"2022-03-14T23:15:08.157","modified":"2026-06-17T04:10:49.297","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-787","CWE-122"],"references":["https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms","https://lists.debian.org/debian-lts-announce/2022/11/msg00002.html","https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms","https://lists.debian.org/debian-lts-announce/2022/11/msg00002.html"],"products":["clickhouse:clickhouse","debian:debian_linux"],"source":"nvd","synced_at":"2026-10-19T21:29:06.454770966+00:00"},"epss":{"cve":"CVE-2021-43304","score":0.01672,"percentile":0.76819,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}