Security readout for executives and security teams
Plain-English summary
A logged-in attacker with limited privileges could exploit a Windows RPC IDL memory-management flaw to gain elevated control. Successful exploitation could compromise sensitive data, alter systems, and disrupt availability. The issue affects multiple supported Windows client and server releases.
Executive priority
Treat as a high-priority patching issue, especially where attackers could already obtain user-level access. It is not evidenced as actively exploited in the supplied sources, but successful escalation could enable full system compromise. Track remediation coverage and unresolved exceptions to completion.
Technical view
CVE-2026-20832 is a CWE-415 double-free vulnerability in Windows Remote Procedure Call Interface Definition Language handling. CVSS 3.1 is 7.8: local access, low complexity, low privileges, no user interaction, unchanged scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure includes the listed Windows 10, Windows 11, and Windows Server 2016 through 2025 releases, including several Server Core installations. Exploitation requires prior local low-privilege access, so compromised accounts, malware footholds, shared systems, and multi-user servers warrant particular attention.
Exploitation context
The bundle reports no CISA KEV listing and assigns CVSS exploit maturity as unproven. No supplied source establishes active exploitation or public exploit availability. Risk remains material because exploitation is rated low complexity after an attacker obtains local low-privilege access.
Researcher notes
The supplied evidence identifies CWE-415 and a local privilege-escalation path but provides no vulnerable function, trigger conditions, patch identifiers, or affected-version boundaries beyond the listed releases and builds. Technical validation should rely on Microsoft’s advisory and authorized update-state assessment; exploitability claims beyond the CVSS metrics are unsupported.
Mitigation direction
- Review Microsoft’s CVE advisory for applicable security updates and release-specific instructions.
- Prioritize affected servers, privileged workstations, shared endpoints, and systems with elevated threat exposure.
- Apply the appropriate Microsoft updates through established patch-management processes.
- Use vendor guidance for any systems that cannot be updated promptly.
Validation and detection
- Inventory endpoints running the affected Windows releases and listed build families.
- Compare installed updates against Microsoft’s CVE advisory for each operating-system release.
- Confirm patched systems successfully rebooted if required by Microsoft’s update guidance.
- Rescan or re-query endpoint inventory to verify update coverage and identify exceptions.
- Monitor endpoint telemetry for suspicious local privilege changes pending full remediation.
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-415: 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-20832 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.85.9microsoftVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/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 Remote Procedure Call Interface Definition Language (IDL) Elevation of Privilege 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.
Double Free
Double Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.