EUVD-2026-73523
GHSA-w6jx-m35w-2f28
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessReach EventLog RPC/SMB interface over network
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DeliverySend crafted event-logging request
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ExploitTrigger out-of-bounds read / heap overflow
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ExecutionCorrupt service heap state
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PersistExecute code in service context
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ImpactFull host compromise
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Heap buffer bounds checking
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | The CVSS vector is AV:N/AC:L/PR:N/UI:N, indicating no authentication and no user interaction are required against a default configuration where the Windows Event Logging Service is reachable over the network. The practical limiting factor is network reachability of the EventLog RPC/named-pipe interface (typically via SMB/TCP 445), which in most enterprises is firewalled off from untrusted networks - so exposure is realistically internal/lateral-movement scope unless port 445/RPC is exposed. All currently-supported Windows editions below the fixed builds are in scope; no non-default feature toggle is called out in the description. |
| Impact | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) describes the worst-case profile: network reachable, low complexity, no privileges, no user interaction, with full confidentiality/integrity/availability impact - hence the 9.8. That said, several real-world signals temper the raw score: no EPSS value was provided, the CVE is not in CISA KEV, and no public POC is referenced, so exploitation is not confirmed and no probability estimate is available. The out-of-bounds-read primitive versus RCE claim is worth verifying against Microsoft's advisory, as reliable pre-auth RCE from an OOB read against modern Windows heap mitigations (ASLR, CFG, heap hardening) is typically non-trivial and may require additional primitives. Overall this is a genuine high priority because the affected service is ubiquitous and potentially remotely reachable, but the realistic difficulty of weaponization is likely higher than AC:L suggests. |
| Exploit ScenarioDerived | An attacker with network reachability to a vulnerable Windows host sends a crafted request to the Event Logging Service's RPC/named-pipe interface, triggering the out-of-bounds read and heap corruption without any credentials or user interaction, and leverages it to execute code in the service context. No public POC is referenced, so this scenario is inferred from the CVSS vector and Microsoft's stated impact rather than demonstrated exploit code. |
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Alert meAnalysisAIv1 – Sep 09, 2026
Remote code execution in the Windows Event Logging Service (EventLog) affects a broad range of currently-supported Windows client and server editions, from Windows 10 1607/1809/21H2/22H2 and Windows 11 through 26H1, to Windows Server 2012 through Server 2025. An out-of-bounds read in the service's network-facing parsing path allows an unauthorized attacker to execute code over the network per Microsoft's advisory, which rates it CVSS 9.8. There is no public exploit identified at time of analysis and it is not in CISA KEV, but the pre-auth, network-reachable profile makes it a high patch-priority item.
RemediationAI
Apply the Microsoft cumulative/security update that raises the EventLog service binaries to at least the fixed build for your edition (e.g. 10.0.19045.7725 for Windows 10 22H2, 10.0.22631.7582 for Windows 11 23H2, 10.0.26100.9445 for Windows 11 24H2/25H2, 10.0.20348.5622 for Server 2022, 10.0.26100.33438 for Server 2025, 6.3.9600.23397 for Server 2012 R2) as documented in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69493 - this is a vendor-released patch and the primary fix. Where immediate patching is not possible, reduce network exposure of the Event Log RPC/named-pipe interfaces: block inbound SMB (TCP 445) and restrict RPC access to the affected hosts at the perimeter and host firewall, and limit remote Event Log access to trusted management subnets; the trade-off is that remote event collection, forwarding, and administrative log queries from those blocked sources will break. These are compensating controls only - patching is the sole complete remediation.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 19 packages in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
The affected component is the Windows Event Logging Service (the EventLog/Windows Event Log subsystem, historically reachable remotely via RPC/MS-EVEN and MS-EVEN6 over SMB named pipes). CWE-122 identifies the root cause as a heap-based buffer overflow, and the input tags 'Buffer Overflow'/'Heap Overflow' reinforce a heap memory-safety defect; the description characterizes the trigger as an out-of-bounds read. Note the mild tension between an out-of-bounds *read* (typically an information-disclosure primitive) and both the CWE-122 heap-overflow classification and Microsoft's 'execute code' impact - the read is likely one stage of a larger heap corruption/exploitation chain. Affected binaries span the EventLog service across the entire supported Windows codebase (see CPE/EUVD version ranges below), indicating a bug in shared core service code rather than an edition-specific feature.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Pre-auth network-reachable service justifies AV:N/PR:N/UI:N and code-exec C/I/A:H, but reliable RCE from an OOB read against modern Windows heap mitigations warrants AC:H over AC:L.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Out-of-bounds read in Windows Event Logging Service allows an unauthorized attacker to execute code over a network.
Executive ViewAI
A critical remote code execution vulnerability in the Windows Event Logging Service affects every supported Windows client and server system in the organization (Windows 10, 11, Server 2012-2025), allowing unauthenticated network attackers to execute arbitrary code without credentials. This vulnerability poses an immediate risk to the entire Windows infrastructure and requires urgent patching to prevent potential widespread compromise of workstations and servers.
Apply vendor patch.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
A heap overflow occurs when a program writes data beyond the bounds of a buffer allocated in the heap memory region.
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