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CVE-2026-49494

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 r
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d4dc630b731d4d4e6b8d4558ddd8ecf9dd13f9a28ead822591944ce630511967
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unaffected","modules":["Inspect.sys"],"product":"Comodo Internet Security","vendor":"Xcitium (formerly Comodo Security Solutions)","versions":[{"lessThanOrEqual":"12.3.4.8162","status":"affected","version":"0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/affected/0

{"defaultStatus":"affected","product":"Xcitium Client Security (XCS)","vendor":"Xcitium","versions":[{"lessThan":"13.8.2.10019","status":"affected","version":"0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/affected/1
cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

2 source assertions
{"defaultStatus":"unaffected","modules":["Inspect.sys"],"product":"Comodo Internet Security","vendor":"Xcitium (formerly Comodo Security Solutions)","versions":[{"lessThanOrEqual":"12.3.4.8162","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/affected/0
{"defaultStatus":"affected","product":"Xcitium Client Security (XCS)","vendor":"Xcitium","versions":[{"lessThan":"13.8.2.10019","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/affected/1

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-191","description":"Integer Underflow (Wrap or Wraparound)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"Proof of Concept","tags":["exploit"],"url":"https://github.com/MalwareTech/ComoDoS"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/references/1
{"name":"MalwareTech - ComoDoS","tags":["technical-description","exploit"],"url":"https://malwaretech.com/2026/06/exploiting-a-remote-kernel-vulnerability-in-comodo-internet-security.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/references/0
{"name":"Xcitium Release Notes","tags":["release-notes","patch"],"url":"https://updates.xcitium.com/#note11312"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/references/2
{"name":"VulnCheck Advisory: Comodo Internet Security Inspect.sys IPv6 Integer Underflow Remote Denial of Service","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/xcitium-client-security-comodo-internet-security-remote-dos"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6b57c3a8a4b6b8fcc0b704fa0d0de7f41cb7bde1ad6799c7cbe1cae4a1be5f2a · sha256:2cd7987b7578f266… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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