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    2 vulnerabilities by Xcitium (formerly Comodo Security Solutions)

    CVE-2026-49494 (GCVE-0-2026-49494)

    Vulnerability from nvd – Published: 2026-06-07 12:08 – Updated: 2026-06-23 14:07
    VLAI
    Title
    Xcitium Client Security / Comodo Internet Security Remote Denial of Service
    Summary
    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.
    Severity
    8.7 (High)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-191 - Integer Underflow (Wrap or Wraparound)
    Assigner
    References
    Impacted products
    Date Public
    2026-06-03 00:00
    Credits
    Marcus Hutchins (MalwareTech)
    Show details on NVD website
    To clipboard 

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    CVE-2026-49494 (GCVE-0-2026-49494)

    Vulnerability from cvelistv5 – Published: 2026-06-07 12:08 – Updated: 2026-06-23 14:07
    VLAI
    Title
    Xcitium Client Security / Comodo Internet Security Remote Denial of Service
    Summary
    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.
    Severity
    8.7 (High)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-191 - Integer Underflow (Wrap or Wraparound)
    Assigner
    References
    Impacted products
    Date Public
    2026-06-03 00:00
    Credits
    Marcus Hutchins (MalwareTech)
    Show details on NVD website
    To clipboard 

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