VULNERABILITY INTELLIGENCE

CVE-2021-42388

CVSS score8.1 HIGH

EPSS probability1.57%

CISA KEVNot currently listed

Published2022-03-14

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Description

Heap out-of-bounds read in Clickhouse's LZ4 compression codec when parsing a malicious query. As part of the LZ4::decompressImpl() loop, a 16-bit unsigned user-supplied value ('offset') is read from the compressed data. The offset is later used in the length of a copy operation, without checking the lower bounds of the source of the copy operation.

Weakness classification

reefs@jfrog.com: CWE-125
nvd@nist.gov: CWE-125

Primary references

reefs@jfrog.com — Exploit, Third Party Advisory
reefs@jfrog.com — Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory