CVE-2021-42389

Public Exploit

Description

Divide-by-zero in Clickhouse's Delta 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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.51%
Third-Party Advisory jfrog.com
Affected: yandex clickhouse
Published at:
Updated at:

References

Link Tags
https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-42389?
CVE-2021-42389 has been scored as a medium severity vulnerability.
How to fix CVE-2021-42389?
To fix CVE-2021-42389, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-42389 being actively exploited in the wild?
It is possible that CVE-2021-42389 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-42389?
CVE-2021-42389 affects yandex clickhouse.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.