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8.8

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 arbit...

CVE-2021-43304 · published 4 years ago
Summary

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 limi...

What to do
  • Update clickhouse clickhouse to version 21.10.2.15 or later.
Affected software
VendorProductAffected versions
clickhouse clickhouse < 21.10.2.15
cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:*
debian debian_linux 10.0
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Original advisory text
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 arbit...
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
8.8 High
Exploitation
2% chance of attack within 30 days
Type
CWE-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
Timeline
Published14 Mar 2022
Updated3 Nov 2026
First seen29 Sep 2026
Sources
CVE-2021-43304 · NVD
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