How severe is CVE-2019-16536?

CVE-2019-16536 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-16536 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-16536?

CVE-2019-16536 affects Clickhouse. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-16536?

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.

Does CVE-2019-16536 have an EU (EUVD) identifier?

Yes. CVE-2019-16536 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-19373.

When was CVE-2019-16536 published?

CVE-2019-16536 was published on 2025-05-21 and last updated on 2026-06-17.

CVE-2019-16536

CVE-2019-16536 is a high-severity vulnerability in Clickhouse with a CVSS 3.x base score of 8.8. 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-120.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 8.2
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2019-19373
Weakness: CWE-120
Affected product: Clickhouse
Published: 2025-05-21
Last modified: 2026-06-17

Description

Stack overflow leading to DoS can be triggered by a malicious authenticated client in Clickhouse before 19.14.3.3.

Frequently asked questions

What is CVE-2019-16536?: Stack overflow leading to DoS can be triggered by a malicious authenticated client in Clickhouse before 19.14.3.3.
How severe is CVE-2019-16536?: CVE-2019-16536 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-16536 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-16536?: CVE-2019-16536 affects Clickhouse. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-16536?: 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.
Does CVE-2019-16536 have an EU (EUVD) identifier?: Yes. CVE-2019-16536 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-19373.
When was CVE-2019-16536 published?: CVE-2019-16536 was published on 2025-05-21 and last updated on 2026-06-17.

References

https://clickhouse.com/docs/whats-new/security-changelog

Affected products (1)

cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:*

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-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…
CVE-2018-14668 — High (CVSS 8.8): In ClickHouse before 1.1.54388, "remote" table function allowed arbitrary symbols in "user", "password" and…

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