How severe is CVE-2018-17189?

CVE-2018-17189 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 none, and availability low.

Is CVE-2018-17189 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-17189?

CVE-2018-17189 primarily affects Apache Http Server. In total, 33 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-17189?

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

When was CVE-2018-17189 published?

CVE-2018-17189 was published on 2019-01-30 and last updated on 2026-06-17.

CVE-2018-17189

CVE-2018-17189 is a medium-severity vulnerability in Apache Http Server with a CVSS 3.x base score of 5.3. Its EPSS exploit-prediction score of 19% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 19% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Apache Http Server
Published: 2019-01-30
Last modified: 2026-06-17

Description

In Apache HTTP server versions 2.4.37 and prior, by sending request bodies in a slow loris way to plain resources, the h2 stream for that request unnecessarily occupied a server thread cleaning up that incoming data. This affects only HTTP/2 (mod_http2) connections.

Frequently asked questions

What is CVE-2018-17189?: In Apache HTTP server versions 2.4.37 and prior, by sending request bodies in a slow loris way to plain resources, the h2 stream for that request unnecessarily occupied a server thread cleaning up that incoming data. This affects only HTTP/2 (mod_http2) connections.
How severe is CVE-2018-17189?: CVE-2018-17189 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 none, and availability low.
Is CVE-2018-17189 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-17189?: CVE-2018-17189 primarily affects Apache Http Server. In total, 33 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-17189?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-17189 published?: CVE-2018-17189 was published on 2019-01-30 and last updated on 2026-06-17.

References

Affected products (33)

cpe:2.3:a:apache:http_server:2.4.17:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.18:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.20:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.23:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.25:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.26:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.27:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.28:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.29:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.30:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.33:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.34:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.35:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.37:*:*:*:*:*:*:*
cpe:2.3:a:netapp:santricity_cloud_connector:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:storage_automation_store:-:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:enterprise_manager_ops_center:12.3.3:*:*:*:*:*:*:*
cpe:2.3:a:oracle:hospitality_guest_access:4.2.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:hospitality_guest_access:4.2.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*
cpe:2.3:a:oracle:retail_xstore_point_of_service:7.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:retail_xstore_point_of_service:7.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:sun_zfs_storage_appliance_kit:8.8.6:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
cpe:2.3:a:redhat:jboss_core_services:1.0:*:*:*:*:*:*:*

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Browse all CWE-400 (Uncontrolled Resource Consumption) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

50.255.62.89 (ipv4-addr)
147.15.15.226 (ipv4-addr)
60.199.224.2 (ipv4-addr)
45.120.115.150 (ipv4-addr)
41.225.238.233 (ipv4-addr)
31.36.163.95 (ipv4-addr)
218.51.148.194 (ipv4-addr)
197.44.15.210 (ipv4-addr)