EUVD-2026-73530
GHSA-f9q9-929x-9w5c
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local LPE requiring only a standard user account (PR:L) with no complexity barriers (AC:L) and full host impact; no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Fax Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in Windows Fax Service (CWE-122) enables local privilege escalation to SYSTEM on a broad range of Windows client and server editions spanning Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through 2025. An authenticated low-privileged local user can trigger the overflow with low attack complexity (AC:L), achieving full confidentiality, integrity, and availability impact (C:H/I:H/A:H). …
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 | Requires a local user session with at minimum a standard (low-privileged) user account on the target Windows system (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world priority is moderate-to-high in environments where Windows Fax Service is actively running, but significantly lower in the many enterprise deployments where the service is disabled or not installed. … 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 Microsoft security updates released for each affected Windows edition. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all Windows devices in your environment, identify those running Fax Service, and assess local user account populations. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today