Security readout for executives and security teams
Plain-English summary
A person with authorized access and physical proximity to an affected Windows device could cause the NDIS networking component to reveal sensitive memory contents. The issue does not alter data or disrupt service, and the supplied evidence does not support remote or active exploitation.
Executive priority
Treat this as a normal-priority security update, accelerated for sensitive or physically accessible systems. The confidentiality impact can be serious, but required physical access, low privileges, and absent evidence of active exploitation reduce immediate enterprise-wide urgency.
Technical view
CVE-2026-20936 is a CWE-125 out-of-bounds read in Windows NDIS. It requires physical attack conditions and low privileges, with no user interaction. Its CVSS 3.1 score is 4.3, reflecting high confidentiality impact but no integrity or availability impact.
Likely exposure
Exposure exists across the listed Windows 10, Windows 11, and Windows Server releases. Devices in public, shared, branch, laboratory, or other physically accessible locations are likely more exposed than tightly controlled systems.
Exploitation context
The source bundle marks the CVE as not included in KEV, and its CVSS vector reports unproven exploit maturity. No supplied source establishes active exploitation or public weaponization. Practical abuse requires authorization, low privileges, and physical attack conditions.
Researcher notes
The flaw class is CWE-125 in Windows NDIS. Assessment should focus on unintended memory disclosure and affected-version verification. The supplied evidence does not identify exposed data types, attack hardware, affected NDIS paths, patch KB numbers, or detection indicators; consult Microsoft’s advisory for release-specific details.
Mitigation direction
- Review Microsoft’s advisory for the security update applicable to each affected Windows release.
- Prioritize physically accessible workstations, servers, kiosks, laboratories, and shared devices.
- Restrict physical access and remove unnecessary low-privilege accounts while updates are pending.
- Apply updates through the organization’s tested Windows servicing process.
Validation and detection
- Inventory systems running the affected Windows releases and versions listed in the source bundle.
- Confirm applicable Microsoft security updates are installed using approved patch-management evidence.
- Verify exposed devices have appropriate physical-access controls and account restrictions.
- Re-scan or re-query endpoints after deployment to confirm remediation coverage.
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.
CWE-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-20936 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
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
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.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C0.73.6microsoftVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Windows NDIS Information Disclosure VulnerabilityCVE reference, microsoft · vendor-advisory, patch
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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.