PT-2021-23613 · Unknown+2 · Clickhouse+1

Or Peles + 1 · Published 2021-10-18 · Updated 2025-06-25 · CVE-2021-42391

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions ClickHouse (affected versions not specified)

Description The issue is related to a divide-by-zero error in ClickHouse's Gorilla compression codec. This occurs when parsing a malicious query, where the first byte of the compressed buffer is used in a modulo operation without being checked for 0.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Divide By Zero

Weakness Enumeration

CWE-369

Related Identifiers

ALT-PU-2022-1418

ALT-PU-2022-1601

ALT-PU-2022-1682

CVE-2021-42391

Affected Products

Alt Linux

Clickhouse

References · 6

• 🔥 https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms · Exploit
• https://osv.dev/vulnerability/CVE-2021-42391 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-42391 · Security Note
• https://t.me/true_secator/2737 · Telegram Post
• https://t.me/nekaspersky/2001 · Telegram Post
• https://t.me/cvenotify/126698 · Telegram Post