CVE-2023-47118
CVE-2023-47118 is a high-severity vulnerability in Clickhouse with a CVSS 3.x base score of 7.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: High (CVSS 3.x base score 7.0)
- EPSS exploit prediction: 0% (37th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-787
- Affected product: Clickhouse
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2023-47118?
- 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.
- How severe is CVE-2023-47118?
- CVE-2023-47118 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.
- Is CVE-2023-47118 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2023-47118?
- CVE-2023-47118 primarily affects Clickhouse. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2023-47118?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2023-47118 published?
- CVE-2023-47118 was published on 2023-12-20 and last updated on 2026-06-17.
References
Affected products (3)
- cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:lts:*:*:*
- cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:*
- cpe:2.3:a:clickhouse:clickhouse_cloud:*:*:*:*:*:*:*:*
More vulnerabilities in Clickhouse
- CVE-2019-16535 — Critical (CVSS 9.8): In all versions of ClickHouse before 19.14, an OOB read, OOB write and integer underflow in decompression algorithms…
- CVE-2018-14671 — Critical (CVSS 9.8): In ClickHouse before 18.10.3, unixODBC allowed loading arbitrary shared objects from the file system which led to a…
- CVE-2018-14670 — Critical (CVSS 9.8): Incorrect configuration in deb package in ClickHouse before 1.1.54131 could lead to unauthorized use of the database.
- CVE-2019-16536 — High (CVSS 8.8): Stack overflow leading to DoS can be triggered by a malicious authenticated client in Clickhouse before 19.14.3.3.
- CVE-2021-43305 — High (CVSS 8.8): Heap buffer overflow in Clickhouse's LZ4 compression codec when parsing a malicious query. There is no verification…
- CVE-2021-43304 — High (CVSS 8.8): Heap buffer overflow in Clickhouse's LZ4 compression codec when parsing a malicious query. There is no verification…
All CVEs affecting Clickhouse →
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