High severity8.8NVD Advisory· Published Mar 14, 2022· Updated Jun 17, 2026
CVE-2021-43305
CVE-2021-43305
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. This issue is very similar to CVE-2021-43304, but the vulnerable copy operation is in a different wildCopy call.
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Affected products
4cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:*range: <21.10.2.15
- (no CPE)
- yandex/clickhousev5Range: unspecified
Patches
Vulnerability mechanics
References
2- jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbmsnvdExploitThird Party Advisory
- lists.debian.org/debian-lts-announce/2022/11/msg00002.htmlnvdMailing ListThird Party Advisory
News mentions
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