CVE-2021-43304
8.8
HIGH
CVSS 3.1
EPSS 0.15%
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.
How to fix CVE-2021-43304
To remediate CVE-2021-43304, upgrade the affected package to a fixed version below.
- Debian/clickhouse—upgrade to 18.16.1+ds-7.2+deb11u1 or later
Is CVE-2021-43304 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 18.16.1+ds-7.2+deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |