Security readout for executives and security teams
CVE-2021-26690 is an Apache HTTP Server availability issue. A malformed Cookie header processed by mod_session can crash affected servers, causing denial of service. The sources do not describe data theft, privilege escalation, or code execution. Likely exposure is internet-facing or internal Apache HTTP Server deployments running 2.4.0-2.4.46 with mod_session enabled or otherwise processing session Cookie headers. Systems using distributor packages should check Debian, Fedora, Gentoo, Oracle, NetApp, or other vendor advisories for fixed builds. Treat this as a timely availability-risk patch for Apache-backed services, especially public web properties. It is not documented as data compromise or remote code execution in the supplied sources, but service crashes can still affect revenue, customer access, and incident response load. Mitigation focus: Apply Apache HTTP Server or operating-system vendor security updates.; Move affected 2.4.0-2.4.46 deployments to a supported non-affected build.; Check distributor advisories for backported apache2/httpd fixes..
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-2021-26690 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
- https://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3ECVE reference · x_refsource_MISC
- [httpd-announce] 20210609 CVE-2021-26690: mod_session NULL pointer dereferenceCVE reference · mailing-list, x_refsource_MLIST
- [httpd-dev] 20210610 Re: svn commit: r1890598 - in /httpd/site/trunk/content/security/json: CVE-2019-17567.json CVE-2020-13938.json CVE-2020-13950.json CVE-2020-35452.json CVE-2021-26690.json CVE-2021-26691.json CVE-2021-30641.json CVE-2021-31618.jsonCVE reference · mailing-list, x_refsource_MLIST
- [debian-lts-announce] 20210709 [SECURITY] [DLA 2706-1] apache2 security updateCVE reference · mailing-list, x_refsource_MLIST
- DSA-4937CVE reference · vendor-advisory, x_refsource_DEBIAN
- GLSA-202107-38CVE reference · vendor-advisory, x_refsource_GENTOO
- FEDORA-2021-dce7e7738eCVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-e3f6dd670dCVE reference · vendor-advisory, x_refsource_FEDORA
- https://www.oracle.com/security-alerts/cpuoct2021.htmlCVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210702-0001/CVE reference · x_refsource_CONFIRM
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.