High 7.5Published Jun 7, 2026

CVE-2026-49494Xcitium Client Security / Comodo Internet Security Remote Denial of Service

Updated under an hour ago (Oct 26, 2026, 7:00 PM ET)

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It affects Xcitium (formerly Comodo Security Solutions) Comodo Internet Security and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Xcitium (formerly Comodo Security Solutions) Comodo Internet Security

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-191
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Jun 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Xcitium (formerly Comodo Security Solutions) Comodo Internet Security xcitium_formerly_comodo_security_solutions:comodo_internet_security (from the name)	through 12.3.4.8162	CNA record
Xcitium Xcitium Client Security (XCS) xcitium:client_security_xcs (from the name)	before 13.8.2.10019	CNA record

References

References

https://malwaretech.com/2026/06/exploiting-a-remote-kernel-vulnerability-in-comodo-internet-security.html	technical-description, exploit
https://github.com/MalwareTech/ComoDoS	exploit
https://updates.xcitium.com/#note11312	release-notes, patch
https://www.vulncheck.com/advisories/xcitium-client-security-comodo-internet-security-remote-dos	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.