EUVD-2026-73509
GHSA-9876-jgmj-56cf
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Network-delivered heap overflow requiring low-privileged auth and user interaction; scope unchanged; privilege escalation yields full system compromise.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Error Reporting allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Heap-based buffer overflow in Windows Error Reporting (WER) enables network-based privilege escalation across a broad range of Windows desktop and server versions. An authenticated low-privileged attacker who can trigger user interaction can exploit the overflow to achieve full confidentiality, integrity, and availability compromise - effectively gaining SYSTEM-level control. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) a low-privileged authenticated account on the target system or network (PR:L - anonymous/unauthenticated access is insufficient); (2) user interaction (UI:R - a targeted user must perform some action, such as acknowledging or interacting with a WER error dialog or triggering a crash report); (3) Windows Error Reporting must be enabled (the default configuration on all affected Windows versions). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.0 vector (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H) reflects a meaningful but not trivially exploitable flaw: while the attack vector is network and complexity is low, exploitation requires both a low-privileged account and user interaction, which limits opportunistic mass exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released cumulative updates that bring each affected Windows version to or above the fixed build thresholds: Windows 10 1607/Server 2016 to 10.0.14393.9512 or later, Windows 10 1809/Server 2019 to 10.0.17763.9245 or later, Windows 10 21H2 to 10.0.19044.7725 or later, Windows 10 22H2 to 10.0.19045.7725 or later, Windows 11 23H2 to 10.0.22631.7582 or later, Windows 11 24H2 to 10.0.26100.9445 or later, Windows 11 25H2 to 10.0.26200.9445 or later, Windows 11 26H1 to 10.0.28000.2954 or later, Server 2012/2012R2 to 6.2.9200.26349/6.3.9600.23397 or later, Server 2022 to 10.0.20348.5622 or later, and Server 2025 to 10.0.26100.33438 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and inventory all Windows 10 and Windows Server 2025 systems across your infrastructure. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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