Vulnerability Database

309,364

Total vulnerabilities in the database

CVE-2021-42388

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.

  • Published: Mar 14, 2022
  • Updated: Nov 16, 2025
  • CVE: CVE-2021-42388
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 8.1
  • AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS v2:

  • Severity: Medium
  • Score: 5.5
  • AV:N/AC:L/Au:S/C:P/I:N/A:P

CWEs:

Software From Fixed in
debian / debian_linux 10.0 10.0.x
clickhouse / clickhouse - 21.10.2.15