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Severity by source

Vendor (microsoft) PRIMARY
MEDIUM
qualitative
NVD
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CIRCL (temporal)
4.8 MEDIUM
cvss
vuln.today AI
5.5 MEDIUM

Local access with low-privilege account required; no scope change, integrity, or availability impact; only kernel memory disclosure confirmed by description and CVSS.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 21:57 vuln.today
CVE Published
Jul 14, 2026 - 17:06 nvd
MEDIUM 5.5

DescriptionNVD

Integer underflow (wrap or wraparound) in Windows Kernel allows an authorized attacker to disclose information locally.

AnalysisAI

Integer underflow in the Windows Kernel enables a locally authenticated attacker to disclose sensitive kernel memory contents across a broad range of Windows 10, Windows 11, and Windows Server platforms. The CVSS vector (AV:L/AC:L/PR:L/UI:N) confirms that any low-privilege local user can trigger the flaw without special configuration or user interaction, yielding high confidentiality impact with no integrity or availability consequences. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain low-privilege local account
Delivery
Execute crafted user-mode application
Exploit
Invoke vulnerable kernel code path
Execution
Integer underflow causes wraparound in kernel
Persist
Kernel copies memory from unintended address to user buffer
Impact
Attacker reads leaked kernel memory

Vulnerability AssessmentAI

Exploitation Exploitation requires a locally authenticated user account with at minimum low-privilege access on the target system (PR:L per CVSS vector AV:L/AC:L/PR:L/UI:N). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS base score of 5.5 (Medium) accurately reflects the limited attack surface: the vulnerability is local-only (AV:L), requires only a low-privilege account (PR:L), and has no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A low-privileged user logged into an unpatched Windows system executes a crafted application or script that issues a specific kernel call, triggering the integer underflow in the vulnerable kernel code path. The arithmetic wraparound causes the kernel to copy memory from an unintended address into a user-accessible buffer, leaking kernel pointers or security token values. …
Remediation Apply the vendor-released patch by deploying the July 2026 Microsoft Security Update via Windows Update, WSUS, or the Microsoft Update Catalog as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50300. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-43845 vulnerability details – vuln.today

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