Medium severity6.5NVD Advisory· Published Mar 14, 2022· Updated Jun 17, 2026
CVE-2021-42391
CVE-2021-42391
Description
Divide-by-zero in Clickhouse's Gorilla compression codec when parsing a malicious query. The first byte of the compressed buffer is used in a modulo operation without being checked for 0.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3cpe: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
1- jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbmsnvdExploitThird Party Advisory
News mentions
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