Security readout for executives and security teams
Plain-English summary
An authorized, low-privilege attacker could remotely disrupt Active Directory Domain Services by causing it to dereference invalid memory. A successful attack affects availability, potentially interrupting directory-dependent authentication and business services. The provided evidence does not indicate data theft, data modification, or remote code execution.
Executive priority
Schedule prompt remediation through the normal security-update process, with priority for critical domain controllers. Although severity is moderate and exploitation is not established, directory-service disruption can have broad operational consequences. Escalate urgency where privileged networks are weakly segmented or low-privilege accounts are frequently compromised.
Technical view
CVE-2026-57976 is a network-reachable null pointer dereference in Active Directory Domain Services, classified as CWE-476. Exploitation requires low privileges but no user interaction. The CVSS 3.1 score is 6.5, with high availability impact, no confidentiality or integrity impact, and unchanged scope.
Likely exposure
Assess all listed Windows versions, prioritizing domain controllers and other systems operating Active Directory Domain Services. The affected list spans Windows Server 2012 through 2025 and several Windows 10 and 11 releases. Internet exposure is not required; an authorized attacker with network access may be sufficient.
Exploitation context
The source bundle reports no CISA KEV listing, and the CVSS vector marks exploit maturity as unproven. Therefore, active exploitation is not established. The attacker must already possess low-level authorization and network access, which makes compromised accounts and malicious insiders relevant threat contexts.
Researcher notes
The evidence identifies the weakness class, access requirements, affected versions, and availability impact. It does not identify the triggering protocol, crash scope, recovery behavior, specific update identifiers, workarounds, or exploitation telemetry. Do not infer memory corruption leading to code execution from the null dereference alone.
Mitigation direction
- Identify the applicable Microsoft security update from the vendor advisory.
- Prioritize update testing and deployment for domain controllers and other AD DS systems.
- Follow Microsoft guidance for any prerequisites, restart requirements, or later revisions.
- Maintain tested recovery procedures for directory-service outages during remediation.
Validation and detection
- Inventory listed Windows versions and identify systems operating Active Directory Domain Services.
- Compare installed security updates against the applicable Microsoft advisory entries.
- Confirm AD DS health and authentication functionality after remediation.
- Review monitoring records for unexplained AD DS crashes, restarts, or availability interruptions.
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-476: 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-2026-57976 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
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C2.83.6microsoftVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 Active Directory Domain Services Denial of Service 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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.