CVE-2021-42387
8.1 · HIGHOverview
CVE-2021-42387 is a high-severity vulnerability affecting clickhouse clickhouse. It was published on March 14, 2022 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
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.
Remediation
Check the references section for vendor advisories and patches from clickhouse. Update clickhouse to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| clickhouse | clickhouse | >= 0, < 21.10.2.15 | Affected |
Frequently Asked Questions
What is CVE-2021-42387?
CVE-2021-42387 is a high-severity vulnerability affecting clickhouse clickhouse. It was published on March 14, 2022 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2021-42387?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-42387?
Check the references section for vendor advisories and patches from clickhouse. Update clickhouse to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-42387?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-42387 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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