EUVD-2026-43796
GHSA-2hwx-q2mm-644r
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable AD DS with low complexity and no user interaction, but requires an authenticated low-privileged foothold (PR:L); code execution on the DC yields high C/I/A.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Active Directory Domain Services allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Active Directory Domain Services (AD DS) allows an authenticated network attacker to run arbitrary code on domain controllers by triggering a heap-based buffer overflow (CWE-122). Affected platforms span Windows Server 2012 through 2025 (including Server Core) and Windows 10/11 clients acting in AD roles, with Microsoft-issued patches available. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target host to be running Active Directory Domain Services (a domain controller) reachable over the network, and the attacker must already hold valid low-privileged authenticated access to the domain (CVSS PR:L), so this is not exploitable by a fully anonymous/unauthenticated attacker. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H describes a network-reachable, low-complexity attack requiring only low privileges and no user interaction, with high impact to confidentiality, integrity, and availability - a serious profile because the target is the domain controller itself, compromise of which effectively means compromise of the entire domain. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained valid low-privileged domain credentials (for example via phishing or a reused password) sends specially crafted requests over the network to a vulnerable domain controller's AD DS interface, triggering the heap overflow and executing code in the AD DS process context to seize control of the domain. No user interaction is required and attack complexity is low, so a single compromised standard account can be escalated into full domain compromise. … |
| Remediation | Apply the Microsoft security update for CVE-2026-49178 to all affected domain controllers and Windows systems; the fix is available per the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49178 (Patch available per vendor advisory - cross-reference that page for the exact per-OS patched build, which is not enumerated in the available data). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all Windows Server 2012-2025 domain controllers and Windows 10/11 clients with AD roles to establish patch scope; restrict unnecessary network access to AD DS services. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Windows 10 Version 1607
View allLocal privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local privilege escalation in the Windows Win32K kernel subsystem (CWE-122 heap-based buffer overflow) lets an already-a
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Local code execution in the Microsoft Message Queuing (MSMQ) Queue Manager affects a broad range of Windows client and s
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Elevation of privilege in the Windows NTFS file-system driver lets an already-authenticated local user escalate to SYSTE
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in the Windows Server Network driver stems from a race condition (CWE-362) that lets an unauthoriz
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Remote code execution in Microsoft Windows Message Queuing (MSMQ) allows an unauthenticated attacker to run arbitrary co
Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today