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CVE-2026-49494

Xcitium Client Security / Comodo Internet Security Remote Denial of Service

Published: Jun 7, 2026Updated: Jul 23, 2026 Sources: CVE List NVD BDUCWE-191
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 56.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-191

Affected Products

Xcitium (formerly Comodo Security Solutions)
commercial·USaka comodo security solutions, citium
Comodo Internet SecurityOn-prem
Security Products / endpoint-av-edr
Xcitium
aka openedr
Xcitium Client Security (XCS)Mixed
Web & CMS Plugins / cms-core
Comodo Security Solutions, Inc.
commercialaka comodo, comodo internet security premium
Comodo Internet SecurityMixed
Security Products / endpoint-av-edr

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://github.com/MalwareTech/ComoDoS
github.com
https://malwaretech.com/2026/06/exploiting-a-remote-kernel-vulnerability-in-comodo-internet-security.html
malwaretech.com
https://updates.xcitium.com/#note11312
updates.xcitium.com
and 4 more references View all →
News mentions
1

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