Security readout for executives and security teams
CVE-2021-31618 can crash an affected Apache HTTP Server child process through a specially crafted HTTP/2 request. The impact is denial of service, not data theft or code execution. The reported exposure is narrow: mod_http2 1.15.17 and Apache HTTP Server 2.4.47, with Apache stating 2.4.47 was never released. Likely exposure is limited to systems running the affected mod_http2/httpd build with HTTP/2 enabled and reachable. Standard released Apache 2.4.47 exposure appears unlikely because Apache says that version was never released. Downstream packages should still be checked against vendor advisories. Treat this as a targeted availability risk, not a broad compromise event. Prioritize internet-facing Apache systems using HTTP/2, especially vendor-packaged builds from the 2021 advisory window. No active exploitation is evidenced in the provided sources. Mitigation focus: Check Apache and distribution advisories for the relevant httpd/apache2 package.; Upgrade affected Apache HTTP Server or mod_http2 packages per vendor guidance.; Avoid deploying Apache HTTP Server 2.4.47 or mod_http2 1.15.17 builds..
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
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Open ATT&CK lookupCVE-2021-31618 mapping review
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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
- https://seclists.org/oss-sec/2021/q2/206CVE reference
- [httpd-cvs] 20210615 svn commit: r1890801 - /httpd/site/trunk/content/security/json/CVE-2021-31618.jsonCVE reference · mailing-list
- [httpd-cvs] 20210615 svn commit: r1075782 - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_24.htmlCVE reference · mailing-list
- FEDORA-2021-051639aad4CVE reference · vendor-advisory
- FEDORA-2021-181f29c392CVE reference · vendor-advisory
- [debian-lts-announce] 20210709 [SECURITY] [DLA 2706-1] apache2 security updateCVE reference · mailing-list
- DSA-4937CVE reference · vendor-advisory
- GLSA-202107-38CVE reference · vendor-advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlCVE reference
- https://security.netapp.com/advisory/ntap-20210727-0008/CVE reference
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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.