Medium severity · published Mar 14, 2022
CVE-2021-42391
Divide-by-zero in Clickhouse's Gorilla compression codec when parsing a malicious query
6.5
CVSS
1.4%
EPSS
No
On KEV
Description
Divide-by-zero in Clickhouse's Gorilla compression codec when parsing a malicious query. The first byte of the compressed buffer is used in a modulo operation without being checked for 0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 72% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CL
Clickhouse · Clickhouse
before 21.10.2.15 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-42391
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-42391
Exploit
https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms
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