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…

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.

Scores

EPSS (exploitation in 30 days)

19.4% · top 2.6% of all CVEs (5 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Weakness

• mod_http2, DoS via slow request bodies
• CWE-400 (opens in a new tab)All about CWE-400 and its CVEs

Affected products

• Apache Software Foundation · Apache HTTP Server

  • affected 2.4.17 to 2.4.37

References (30)

• https://httpd.apache.org/security/vulnerabilities_24.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• 106685 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• https://security.netapp.com/advisory/ntap-20190125-0001/ (opens in a new tab)x_refsource_CONFIRMx_transferred
• FEDORA-2019-0300c36537 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• FEDORA-2019-133a8a7cb5 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• GLSA-201903-21 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
• 20190403 [SECURITY] [DSA 4422-1] apache2 security update (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• USN-3937-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• DSA-4422 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html (opens in a new tab)x_refsource_MISCx_transferred
• https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html (opens in a new tab)x_refsource_MISCx_transferred
• [httpd-cvs] 20190815 svn commit: r1048743 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20190815 svn commit: r1048742 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03950en_us (opens in a new tab)x_refsource_CONFIRMx_transferred
• RHSA-2019:3933 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• RHSA-2019:3935 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• RHSA-2019:3932 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• RHSA-2019:4126 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• https://www.tenable.com/security/tns-2019-09 (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://www.oracle.com/security-alerts/cpujan2020.html (opens in a new tab)x_refsource_MISCx_transferred
• [httpd-cvs] 20200401 svn commit: r1058586 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20200401 svn commit: r1058587 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073143 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073140 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073139 [11/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1888194 [12/13] - /httpd/site/trunk/content/security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073149 [12/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210606 svn commit: r1075470 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2018-17189](https://trackcve.app/badge/CVE-2018-17189.svg)](https://trackcve.app/cve/CVE-2018-17189)

Record last updated 17 Sept 2024, 01:21 UTC.