TI-2021-18801 Aliases CVE-2021-42387 GHSA-cf9g-639p-3wvv

Out-of-bounds read in Yandex clickhouse

LOW 38CWE-125Published 2022-03-14 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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 upper bounds of the source of the copy operation.

Why it matters now

EPSS 0.01573 75th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed clickhouse (yandex): 21.10.2.15-stable

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Yandex	clickhouse	before 21.10.2.15-stable	21.10.2.15-stable	Patch available	CNA

clickhouse VendorYandex Affected before 21.10.2.15-stable Fixed in 21.10.2.15-stable Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:clickhouse:clickhouse::::::::	before 21.10.2.15	Vulnerable	ClickHouse
cpe:2.3:o:debian:debian_linux:10.0:::::::*	10.0	Vulnerable	Debian

cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:* Versions before 21.10.2.15 Vulnerable ·ClickHouse
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian

Remediation

Fix · CNA clickhouse (yandex) Fixed in 21.10.2.15-stable

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2022-03-14
yandex clickhouse 21.10.2.15-stable
7 records Highest priority Priority MEDIUM 2 MEDIUM, 5 LOW
Other records, highest priority first
- TI-2021-19298 Heap-based buffer overflow in Yandex clickhousePriority MEDIUM 41
- TI-2021-19297 Heap-based buffer overflow in Yandex clickhousePriority MEDIUM 41
- TI-2021-18802 Out-of-bounds read in Yandex clickhousePriority LOW 38
Show all 7 records →

Timeline

2026-10-02 Threatist record created from CVE-2021-42387
2026-10-03 Alias added: GHSA-cf9g-639p-3wvv

References

Exploit 1

https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms

Advisory 1

[debian-lts-announce] 20221104 [SECURITY] [DLA 3176-1] clickhouse security update

TI-2023-14000 An issue found in Yandex Navigator v.6.60 for Android allows unauthorized apps to cause… CVSS 3.1HIGH 7.8
TI-2023-14001 An issue found in Yandex Navigator v.6.60 for Android allows unauthorized apps to cause a… CVSS 3.1MEDIUM 5.5
TI-2021-19298 Heap-based buffer overflow in Yandex clickhouse CVSS 3.1HIGH 8.8
TI-2021-19297 Heap-based buffer overflow in Yandex clickhouse CVSS 3.1HIGH 8.8
TI-2024-06006 DLL Hijacking in Yandex Browser CVSS 4.0HIGH 8.4
TI-2016-08707 Cryptographic flaw in HackerOne tomita-parser node module CVSS 3.0HIGH 8.1

See all 41 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences