Security readout for executives and security teams
CVE-2021-34798 is an Apache HTTP Server flaw where malformed requests can trigger a NULL pointer dereference. In practical terms, an exposed Apache web server could become unstable or crash, affecting availability. The provided sources do not show data theft, remote code execution, or confirmed active exploitation. Organizations running Apache HTTP Server 2.4.48 or earlier, including vendor appliances or bundled products that embed Apache httpd, should assume potential exposure until versions and vendor advisories are verified. Treat this as a timely availability-risk patching item for exposed web services, not as a confirmed breach indicator. Prioritize critical public sites and vendor products that embed Apache httpd. Mitigation focus: Inventory internet-facing Apache HTTP Server instances and embedded httpd dependencies.; Upgrade affected Apache HTTP Server deployments following Apache or OS vendor guidance.; Apply vendor-specific updates for Cisco, Debian, Fedora, and other bundled-product advisories as applicable..
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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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.
CWE-476: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-34798 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
- FEDORA-2021-dce7e7738eCVE reference · vendor-advisory, x_refsource_FEDORA
- [httpd-users] 20210923 [users@httpd] 2.4.49 security fixes: more infoCVE reference · mailing-list, x_refsource_MLIST
- [httpd-users] 20210923 Re: [users@httpd] 2.4.49 security fixes: more infoCVE reference · mailing-list, x_refsource_MLIST
- [httpd-users] 20210923 [users@httpd] Re: [External] : [users@httpd] 2.4.49 security fixes: more infoCVE reference · mailing-list, x_refsource_MLIST
- [httpd-users] 20210923 Re: [users@httpd] Re: [External] : [users@httpd] 2.4.49 security fixes: more infoCVE reference · mailing-list, x_refsource_MLIST
- FEDORA-2021-e3f6dd670dCVE reference · vendor-advisory, x_refsource_FEDORA
- [debian-lts-announce] 20211002 [SECURITY] [DLA 2776-1] apache2 security updateCVE reference · mailing-list, x_refsource_MLIST
- DSA-4982CVE reference · vendor-advisory, x_refsource_DEBIAN
- 20211124 Multiple Vulnerabilities in Apache HTTP Server Affecting Cisco Products: November 2021CVE reference · vendor-advisory, x_refsource_CISCO
- https://www.oracle.com/security-alerts/cpujan2022.htmlCVE reference · x_refsource_MISC
- https://www.tenable.com/security/tns-2021-17CVE reference · x_refsource_CONFIRM
- https://security.netapp.com/advisory/ntap-20211008-0004/CVE reference · x_refsource_CONFIRM
- https://kc.mcafee.com/corporate/index?page=content&id=SB10379CVE reference · x_refsource_CONFIRM
- https://www.oracle.com/security-alerts/cpuapr2022.htmlCVE reference · x_refsource_MISC
- https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdfCVE reference · x_refsource_CONFIRM
- GLSA-202208-20CVE reference · vendor-advisory, x_refsource_GENTOO
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.