EUVD-2026-73261
GHSA-cfr4-p6vg-6j7h
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network-reachable MSMQ service, no interaction, use-after-free yielding full code execution justifies AV:N/AC:L/PR:N/UI:N and C/I/A:H; MSMQ-enabled precondition does not change base metrics.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Use after free in Windows Message Queuing allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft's Windows Message Queuing (MSMQ) service affects all supported Windows client and server releases and lets an unauthenticated remote attacker corrupt memory via a use-after-free (CWE-416) to run arbitrary code. The flaw carries a critical CVSS 9.8 with a fully remote, no-interaction, no-privilege vector. …
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 that the target host has the optional Windows Message Queuing (MSMQ) feature installed and the service running with its listener (typically TCP port 1801) reachable by the attacker - MSMQ is not present in default Windows installations, which is the primary limiting factor. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, 9.8) describes a maximally severe network-reachable, unauthenticated, no-interaction RCE - the classic 'wormable service' profile that MSMQ RCEs have historically fit. … 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 cumulative security update for your OS build (Patch available per vendor advisory): upgrade to at or above the fixed build for your release - e.g. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all systems running MSMQ or Windows Server editions with MSMQ enabled, prioritizing systems handling sensitive data or mission-critical operations; segregate or isolate systems that cannot be immediately patched. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
View allShare
External POC / Exploit Code
Leaving vuln.today