CVE-2026-49494
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk41th percentile - higher than 41% of all known CVEs
Summary
Xcitium Client Security before version 13.8.2.10019 and Comodo Internet Security up to version 12.3.4.8162 contain an integer underflow vulnerability in the firewall driver Inspect.sys. This allows remote unauthenticated attackers to crash the system by sending a crafted IPv6 packet.
Risk Assessment
This vulnerability can lead to system crashes, resulting in service availability interruptions and potential financial losses for the organization.
Recommendation
It is recommended to update to Xcitium Client Security version 13.8.2.10019 or newer and Comodo Internet Security version 12.3.4.8162 or newer to mitigate this vulnerability.
Original NVD description (English source)
Xcitium Client Security (XCS) before 13.8.2.10019 and Comodo Internet Security (CIS) through 12.3.4.8162 (fix expected by 2026 Q3) contain an integer underflow vulnerability in the firewall driver Inspect.sys that allows remote unauthenticated attackers to crash the system by sending a crafted IPv6 packet with a declared payload length smaller than the sum of its extension-header lengths. The unsigned 64-bit payload-length value underflows to a near-maximal integer, triggering an out-of-bounds read and oversized memcpy in the Windows kernel at DISPATCH_LEVEL, resulting in a blue screen of death even on hosts with all ports blocked.