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CVE-2026-20067

Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection.  This vulnerability is due to incomplete error checking when parsing the Multicast DNS fields of the HTTP header. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3252b05baeb3b7d36adc707fc706e3bf2769a0ec7e560fa8524d3fe7793160fe
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 3 assertions

{"defaultStatus":"unknown","product":"Cisco Cyber Vision","vendor":"Cisco","versions":[{"status":"affected","version":"3.0.0"},{"status":"affected","version":"3.0.2"},{"status":"affected","version":"3.0.3"},{"status":"affected","version":"3.0.1"},{"status":"affected","version":"3.1.0"},{"status":"affected","version":"3.0.4"},{"status":"affected","version":"3.1.1"},{"status":"affected","version":"3.1.2"},{"status":"affected","version":"3.2.0"},{"status":"affected","version":"3.0.5"},{"status":"affected","version":"3.2.1"},{"status":"affected","version":"3.0.6"},{"status":"affected","version":"3…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:89658ca45bd586796e2ed0c6ebbc6ae51c2f2fd8a5f3322ca8d45b9f030b470e · sha256:2aac99041099ba45… · /containers/cna/affected/0

{"defaultStatus":"unknown","product":"Cisco UTD SNORT IPS Engine Software","vendor":"Cisco","versions":[{"status":"affected","version":"17.3.1a"},{"status":"affected","version":"17.2.1r"},{"status":"affected","version":"17.3.2"},{"status":"affected","version":"17.4.1a"},{"status":"affected","version":"17.5.1"},{"status":"affected","version":"17.3.3"},{"status":"affected","version":"17.5.1a"},{"status":"affected","version":"17.3.4"},{"status":"affected","version":"17.3.4a"},{"status":"affected","version":"17.4.2"},{"status":"affected","version":"17.4.1b"},{"status":"affected","version":"17.6.1a…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:89658ca45bd586796e2ed0c6ebbc6ae51c2f2fd8a5f3322ca8d45b9f030b470e · sha256:2aac99041099ba45… · /containers/cna/affected/2

{"defaultStatus":"unknown","product":"Cisco Secure Firewall Threat Defense (FTD) Software","vendor":"Cisco","versions":[{"status":"affected","version":"7.0.0"},{"status":"affected","version":"7.0.0.1"},{"status":"affected","version":"7.0.1"},{"status":"affected","version":"7.1.0"},{"status":"affected","version":"7.0.1.1"},{"status":"affected","version":"7.1.0.1"},{"status":"affected","version":"7.0.2"},{"status":"affected","version":"7.2.0"},{"status":"affected","version":"7.0.2.1"},{"status":"affected","version":"7.0.3"},{"status":"affected","version":"7.1.0.2"},{"status":"affected","version"…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:89658ca45bd586796e2ed0c6ebbc6ae51c2f2fd8a5f3322ca8d45b9f030b470e · sha256:2aac99041099ba45… · /containers/cna/affected/1

Affected products and versions

3 source assertions
{"defaultStatus":"unknown","product":"Cisco Cyber Vision","vendor":"Cisco","versions":[{"status":"affected","version":"3.0.0"},{"status":"affected","version":"3.0.2"},{"status":"affected","version":"3.0.3"},{"status":"affected","version":"3.0.1"},{"status":"affected","version":"3.1.0"},{"status":"affected","version":"3.0.4"},{"status":"affected","version":"3.1.1"},{"status":"affected","version":"3.1.2"},{"status":"affected","version":"3.2.0"},{"status":"affected","version":"3.0.5"},{"status":"affected","version":"3.2.1"},{"status":"affected","version":"3.0.6"},{"status":"affected","version":"3…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:89658ca45bd586796e2ed0c6ebbc6ae51c2f2fd8a5f3322ca8d45b9f030b470e · sha256:2aac99041099ba45… · /containers/cna/affected/0
{"defaultStatus":"unknown","product":"Cisco UTD SNORT IPS Engine Software","vendor":"Cisco","versions":[{"status":"affected","version":"17.3.1a"},{"status":"affected","version":"17.2.1r"},{"status":"affected","version":"17.3.2"},{"status":"affected","version":"17.4.1a"},{"status":"affected","version":"17.5.1"},{"status":"affected","version":"17.3.3"},{"status":"affected","version":"17.5.1a"},{"status":"affected","version":"17.3.4"},{"status":"affected","version":"17.3.4a"},{"status":"affected","version":"17.4.2"},{"status":"affected","version":"17.4.1b"},{"status":"affected","version":"17.6.1a…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:89658ca45bd586796e2ed0c6ebbc6ae51c2f2fd8a5f3322ca8d45b9f030b470e · sha256:2aac99041099ba45… · /containers/cna/affected/2
{"defaultStatus":"unknown","product":"Cisco Secure Firewall Threat Defense (FTD) Software","vendor":"Cisco","versions":[{"status":"affected","version":"7.0.0"},{"status":"affected","version":"7.0.0.1"},{"status":"affected","version":"7.0.1"},{"status":"affected","version":"7.1.0"},{"status":"affected","version":"7.0.1.1"},{"status":"affected","version":"7.1.0.1"},{"status":"affected","version":"7.0.2"},{"status":"affected","version":"7.2.0"},{"status":"affected","version":"7.0.2.1"},{"status":"affected","version":"7.0.3"},{"status":"affected","version":"7.1.0.2"},{"status":"affected","version"…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:89658ca45bd586796e2ed0c6ebbc6ae51c2f2fd8a5f3322ca8d45b9f030b470e · sha256:2aac99041099ba45… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.8,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:89658ca45bd586796e2ed0c6ebbc6ae51c2f2fd8a5f3322ca8d45b9f030b470e · sha256:2aac99041099ba45… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-787","description":"Out-of-bounds Write","lang":"en","type":"cwe"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:89658ca45bd586796e2ed0c6ebbc6ae51c2f2fd8a5f3322ca8d45b9f030b470e · sha256:2aac99041099ba45… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"cisco-sa-snort3-multi-dos-XFWkWSwz","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:89658ca45bd586796e2ed0c6ebbc6ae51c2f2fd8a5f3322ca8d45b9f030b470e · sha256:2aac99041099ba45… · /containers/cna/references/0

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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