The CVSS 7.8 rating on this MSMQ heap buffer overflow obscures more than it reveals. The 0.00246 EPSS score tells the real story: this vulnerability sits in a deprecated Windows component that attackers have little incentive to target and defenders have largely stopped monitoring. That combination creates a dangerous blind spot.
MSMQ—Windows Message Queuing—serves as a trust broker between applications. A heap overflow here doesn't just mean owning a service; it means owning a node in a message bus that downstream consumers trust without re-validation. The blast radius extends to any process that consumes messages from queues on that system. The fact that MSMQ is deprecated doesn't shrink this radius—it widens it, because the organizations still running it in 2026 are precisely those with stubborn legacy integrations that cannot be easily refactored or replaced.
The 'local only' framing in the CVSS vector is also misleading. In typical Active Directory environments, MSMQ network endpoints are open to authenticated domain users by default. The 'local access' precondition may already be satisfied through normal network authentication—a crafted message sent from any domain-joined workstation could trigger the overflow path without needing shell access first.
Modern heap hardening in Windows 10 and 11 has significantly reduced the reliability of heap exploitation compared to the 2000s era when similar bugs were routinely weaponized. Segment cookies, ETW telemetry detecting abnormal allocation patterns, and fundamental changes to allocator behavior have collapsed the success rate. This explains why EPSS stays low even as CVSS remains high—the vulnerability is technically severe but practically difficult to exploit reliably.
What matters most is the remediation timeline. MSMQ patches require service restarts that trigger change management approval cycles for the line-of-business applications depending on them. This CVE will sit in disclosed-but-unfixed state longer than equivalent bugs in actively-maintained components. The exposure window isn't measured in days—it's measured in the enterprise deployment lag between patch release and production rollout. Defenders should prioritize asset visibility: identify systems running MSMQ, assess whether downstream consumers perform their own message validation (they should, regardless), and treat this as a high-priority remediation despite the low EPSS, because the consequence of exploitation far exceeds the probability of it.