CVE-2006-3840: The SMB Mailslot parsing functionality in PAM in multiple ISS products with XPU (24.39/1.78/epj/x.x.x.1780)...

Security readout for executives and security teams

This CVE affects older ISS intrusion-prevention and endpoint security products. A crafted SMB packet can make the product’s SMB Mailslot parser loop indefinitely, causing a denial of service. The business impact is loss of security monitoring or protection, not data theft based on the provided sources. Exposure is most likely in legacy environments still running ISS Proventia, BlackICE, or RealSecure products with the affected XPU versions and SMB inspection enabled or reachable by SMB traffic. Treat this as a legacy security-control availability risk. Prioritize environments where affected products protect critical networks, because a successful attack could blind or disable inspection rather than compromise data directly. Mitigation focus: Identify any ISS Proventia, BlackICE, or RealSecure deployments.; Check vendor or IBM guidance for fixed XPU or product updates.; Restrict SMB exposure to trusted network segments where possible..

Prepared

Jun 29, 2026, 11:25 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.