CVE-2023-47118

7.0 HIGH 0.5% exploit odds Fix listed

What it is

ClickHouse® is an open-source column-oriented database management system that allows generating analytical data reports in real-time. A heap buffer overflow issue was discovered in ClickHouse server. An attacker could send a specially crafted payload to the native interface exposed by default on port 9000/tcp, triggering a bug in the decompression logic of T64 codec that crashes the ClickHouse server process. This attack does not require authentication. Note that this exploit can also be triggered via HTTP protocol, however, the attacker will need a valid credential as the HTTP authentication take places first. This issue has been fixed in version 23.10.2.13-stable, 23.9.4.11-stable, 23.8.6.16-lts and 23.3.16.7-lts.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 0.5% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2023-12-20 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 06:32 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.5% in the next 30 days (EPSS).
Severity: 7.0 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2023-12-20 17:15 UTC
Last modified: 2026-06-17 06:32 UTC
Exploit probability: 0.5% · EPSS, next 30 days
Weakness: CWE-122
Record status: Modified

Affected

Clickhouse < 23.3.16.7
Clickhouse < 23.8.6.16
Clickhouse < 23.9.4.11
Clickhouse < 23.10.2.13
Clickhouse Cloud < 23.9.2.47475

Attack profile CVSS 3.1 · 7.0

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record