Security readout for executives and security teams
Plain-English summary
CVE-2018-1333 can make vulnerable Apache HTTP Server deployments tie up workers longer than needed when handling crafted HTTP/2 requests. The business risk is service degradation or outage, not data theft, based on the provided sources.
Executive priority
Treat this as a timely availability-risk cleanup for Apache estates, especially internet-facing HTTP/2 services. It is not evidenced as actively exploited in the bundle, but vulnerable systems can be driven toward denial of service and should be patched through normal emergency or accelerated maintenance channels.
Technical view
Apache HTTP Server versions 2.4.18 through 2.4.30 and 2.4.33 are listed as affected. Crafted HTTP/2 requests can cause workers to be retained for an extra 60 seconds, enabling worker exhaustion and denial of service. Apache fixed this in 2.4.34.
Likely exposure
Exposure is most likely on public or internal Apache HTTP Server instances with HTTP/2 enabled and running affected versions or unpatched downstream packages. Red Hat, Ubuntu, NetApp, and HPE advisories indicate vendor-package relevance, but the bundle does not prove every product configuration is affected.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The issue is remotely triggerable in concept through crafted HTTP/2 requests, but no exploit maturity, public weaponization, or observed campaign evidence is provided.
Researcher notes
Key evidence is Apache's affected-version and fixed-version statement. The bundle lacks CVSS, CWE, proof-of-concept status, and configuration prerequisites beyond HTTP/2 request handling. Avoid assuming data compromise; focus validation on version, HTTP/2 exposure, downstream backports, and operational symptoms of worker exhaustion.
Mitigation direction
- Upgrade Apache HTTP Server to 2.4.34 or later.
- Apply fixed operating-system vendor packages where Apache is vendor-managed.
- Review Red Hat, Ubuntu, HPE, and NetApp guidance for affected packaged products.
- Prioritize internet-facing HTTP/2 services before internal-only systems.
- If upgrade is blocked, check vendor guidance for supported temporary mitigations.
Validation and detection
- Inventory Apache HTTP Server versions across public and internal web services.
- Confirm whether HTTP/2 is enabled on each Apache deployment.
- Check vendor package changelogs for backported CVE-2018-1333 fixes.
- Review web service monitoring for worker exhaustion or availability degradation.
- Verify remediation by confirming fixed Apache or vendor package versions.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-1333 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2018:3558CVE reference · vendor-advisory, x_refsource_REDHAT
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_usCVE reference · x_refsource_CONFIRM
- RHSA-2019:0367CVE reference · vendor-advisory, x_refsource_REDHAT
- https://security.netapp.com/advisory/ntap-20180926-0007/CVE reference · x_refsource_CONFIRM
- https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-1333CVE reference · x_refsource_CONFIRM
- USN-3783-1CVE reference · vendor-advisory, x_refsource_UBUNTU
- RHSA-2019:0366CVE reference · vendor-advisory, x_refsource_REDHAT
- [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.htmlCVE reference · mailing-list, x_refsource_MLIST
- [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.htmlCVE reference · mailing-list, x_refsource_MLIST
- https://www.tenable.com/security/tns-2019-09CVE reference · x_refsource_CONFIRM
- [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.htmlCVE reference · mailing-list, x_refsource_MLIST
- [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.htmlCVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073143 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/CVE reference · mailing-list, x_refsource_MLIST
- [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.htmlCVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073139 [11/13] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1888194 [12/13] - /httpd/site/trunk/content/security/json/CVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/CVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073149 [12/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/CVE reference · mailing-list, x_refsource_MLIST
- [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.htmlCVE reference · mailing-list, x_refsource_MLIST
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.