How severe is CVE-2019-18657?

CVE-2019-18657 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2019-18657 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18657?

CVE-2019-18657 affects Clickhouse. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-18657?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-18657 published?

CVE-2019-18657 was published on 2019-10-31 and last updated on 2026-06-17.

CVE-2019-18657

CVE-2019-18657 is a medium-severity vulnerability in Clickhouse with a CVSS 3.x base score of 5.3. 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-74.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Clickhouse
Published: 2019-10-31
Last modified: 2026-06-17

Description

ClickHouse before 19.13.5.44 allows HTTP header injection via the url table function.

Frequently asked questions

What is CVE-2019-18657?: ClickHouse before 19.13.5.44 allows HTTP header injection via the url table function.
How severe is CVE-2019-18657?: CVE-2019-18657 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2019-18657 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18657?: CVE-2019-18657 affects Clickhouse. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-18657?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-18657 published?: CVE-2019-18657 was published on 2019-10-31 and last updated on 2026-06-17.

References

Affected products (1)

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

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