Medium
Security advisory
Multiple Cisco products are affected by a vulnerability in the Snort Intrusion Prevention System (IPS) rule engine that could allow an unauthenticated, remote attacker to bypass the configured rules on an affected system. This vulnerability is due to incorrect HTTP packet handling. An attacker could exploit this vulnerability by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass configured IPS rules and allow uninspected traffic onto the network.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2024-20363
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 05:41 UTC · Revision 1
Source evidence
Multiple Cisco products are affected by a vulnerability in the Snort Intrusion Prevention System (IPS) rule engine that could allow an unauthenticated, remote attacker to bypass the configured rules on an affected system. This vulnerability is due to incorrect HTTP packet handling. An attacker could exploit this vulnerability by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass configured IPS rules and allow uninspected traffic onto the network.
osv:CVE-2024-20363
Complete source record
{
"id": "d80d6d10f1adf1cbe0ae03dbbf5897e892660ad94d16769ebf2ddd01c3f198dc",
"url": "https://osv.dev/vulnerability/CVE-2024-20363",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2024-20363",
"summary": "Multiple Cisco products are affected by a vulnerability in the Snort Intrusion Prevention System (IPS) rule engine that could allow an unauthenticated, remote attacker to bypass the configured rules on an affected system. This vulnerability is due to incorrect HTTP packet handling. An attacker could exploit this vulnerability by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass configured IPS rules and allow uninspected traffic onto the network.",
"evidence": "osv:CVE-2024-20363",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2024-20363",
"aliases": [
"CVE-2024-20363"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/snort3/snort3",
"type": "GIT",
"events": [
{
"introduced": "7ae50f4be245efd469dee2ce2855b6235b07aa42"
},
{
"fixed": "0649974b0f946b0de2f29c3edd55852c88e00013"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:cisco:snort:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.0-233"
},
{
"fixed": "3.1.69.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"3.1.67.0",
"3.1.66.0",
"3.1.65.0",
"3.1.64.0",
"3.1.63.0",
"3.1.62.0",
"3.1.61.0",
"3.1.60.0",
"3.1.59.0",
"3.1.58.0",
"3.1.57.0",
"3.1.56.0",
"3.1.55.0",
"3.1.53.0",
"3.1.52.0",
"3.1.51.0",
"3.1.50.0",
"3.1.49.0",
"3.1.48.0",
"3.1.47.0",
"3.1.45.0",
"3.1.43.0",
"3.1.42.0",
"3.1.41.0",
"3.1.40.0",
"3.1.39.0",
"3.1.38.0",
"3.1.37.0",
"3.1.36.0",
"3.1.35.0",
"3.1.34.0",
"3.1.33.0",
"3.1.32.0",
"3.1.31.0",
"3.1.30.0",
"3.1.29.0",
"3.1.28.0",
"3.1.27.0",
"3.1.26.0",
"3.1.25.0",
"3.1.24.0",
"3.1.23.0",
"3.1.22.0",
"3.1.21.0",
"3.1.20.0",
"3.1.19.0",
"3.1.18.0",
"3.1.17.0",
"3.1.16.0",
"3.1.15.0",
"3.1.14.0",
"3.1.13.0",
"3.1.12.0",
"3.1.11.0",
"3.1.10.0",
"3.1.9.0",
"3.1.8.0",
"3.1.7.0",
"3.1.6.0",
"3.1.5.0",
"3.1.4.0",
"3.1.3.0",
"3.1.2.0",
"3.1.1.0",
"3.1.0.0",
"3.0.3-6",
"3.0.3-5",
"3.0.3-4",
"3.0.3-3",
"3.0.3-2",
"3.0.3-1",
"3.0.2-6",
"3.0.2-5",
"3.0.2-4",
"3.0.2-3",
"3.0.2-2",
"3.0.2-1",
"3.0.1-5",
"3.0.1-4",
"3.0.1-3",
"3.0.1-2",
"3.0.1-1",
"3.0.0-270",
"3.0.0-269",
"3.0.0-268",
"3.0.0-267",
"3.0.0-266",
"3.0.0-265",
"3.0.0-264",
"3.0.0-263",
"3.0.0-262",
"3.0.0-261",
"3.0.0-260",
"3.0.0-259",
"3.0.0-258",
"3.0.0-257",
"3.0.0-256",
"3.0.0-255",
"3.0.0-254",
"3.0.0_253",
"3.0.0-253",
"3.0.0-252",
"3.0.0-251",
"3.0.0-250",
"3.0.0-249",
"BUILD_248",
"3.0.0-248",
"BUILD_247",
"3.0.0-247",
"3.0.0-246",
"3.0.0-245",
"3.0.0-244",
"BUILD_243",
"3.0.0-243",
"BUILD_242",
"3.0.0-242",
"BUILD_241",
"3.0.0-241",
"BUILD_240",
"3.0.0-240",
"BUILD_239",
"3.0.0-239",
"BUILD_233",
"3.0.0-233"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-20363.json"
}
}
],
"modified": "2026-10-24T10:30:32.441664951Z",
"provider": "osv",
"references": [
"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-ips-bypass-uE69KBMd"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.0:*:*:*:*:*:*:*"
],
"vendor_product": "cisco:secure_firewall_threat_defense",
"extracted_events": [
{
"range": [
{
"introduced": "7.4.0"
},
{
"last_affected": "7.4.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.1a:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.2:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.6.4:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.6.5:*:*:*:*:*:*:*"
],
"vendor_product": "cisco:unified_threat_defense_snort_intrusion_prevention_system_engine",
"extracted_events": [
{
"range": [
{
"introduced": "17.6.4"
},
{
"last_affected": "17.6.4"
},
{
"introduced": "17.6.5"
},
{
"last_affected": "17.6.5"
},
{
"introduced": "17.12.1a"
},
{
"last_affected": "17.12.1a"
},
{
"introduced": "17.12.2"
},
{
"last_affected": "17.12.2"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2024-20363",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 433033,
"published_at": "2024-05-22T17:16:13.95+00:00"
}