Medium
Security advisory
Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to improper range checking when decompressing VBA data, which is user controlled. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause an overflow of heap data, which could cause a DoS condition.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-20053
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:54 UTC · Revision 1
Source evidence
Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to improper range checking when decompressing VBA data, which is user controlled. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause an overflow of heap data, which could cause a DoS condition.
osv:CVE-2026-20053
Complete source record
{
"id": "5b4b14c69f2fed37b989daf816e07e76ec1e499186a4750c2499483fa755e897",
"url": "https://osv.dev/vulnerability/CVE-2026-20053",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-20053",
"summary": "Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to improper range checking when decompressing VBA data, which is user controlled. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause an overflow of heap data, which could cause a DoS condition.",
"evidence": "osv:CVE-2026-20053",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-20053",
"aliases": [
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"metrics": [
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"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L"
}
],
"affected": [
{
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{
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"type": "GIT",
"events": [
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"database_specific": {
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}
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],
"modified": "2026-10-24T10:31:00.105576389Z",
"provider": "osv",
"references": [
"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed"
],
"provider_metadata": {
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"cpe:2.3:a:cisco:secure_firewall_threat_defense:7.7.0:*:*:*:*:*:*:*",
"cpe:2.3:a:cisco:secure_firewall_threat_defense:7.7.10.1:*:*:*:*:*:*:*",
"cpe:2.3:a:cisco:secure_firewall_threat_defense:7.7.10:*:*:*:*:*:*:*"
],
"vendor_product": "cisco:secure_firewall_threat_defense",
"extracted_events": [
{
"range": [
{
"introduced": "7.2.0"
},
{
"last_affected": "7.2.0"
},
{
"introduced": "7.2.0.1"
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{
"last_affected": "7.2.0.1"
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{
"introduced": "7.2.1"
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{
"last_affected": "7.2.1"
},
{
"introduced": "7.2.2"
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{
"last_affected": "7.2.2"
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{
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{
"last_affected": "7.2.3"
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{
"introduced": "7.2.4"
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{
"last_affected": "7.2.4"
},
{
"introduced": "7.2.4.1"
},
{
"last_affected": "7.2.4.1"
},
{
"introduced": "7.2.5"
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{
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},
{
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{
"last_affected": "7.2.5.1"
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{
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{
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{
"introduced": "7.2.6"
},
{
"last_affected": "7.2.6"
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{
"introduced": "7.2.7"
},
{
"last_affected": "7.2.7"
},
{
"introduced": "7.2.8"
},
{
"last_affected": "7.2.8"
},
{
"introduced": "7.2.8.1"
},
{
"last_affected": "7.2.8.1"
},
{
"introduced": "7.2.9"
},
{
"last_affected": "7.2.9"
},
{
"introduced": "7.2.10"
},
{
"last_affected": "7.2.10"
},
{
"introduced": "7.2.10.2"
},
{
"last_affected": "7.2.10.2"
},
{
"introduced": "7.3.0"
},
{
"last_affected": "7.3.0"
},
{
"introduced": "7.3.1"
},
{
"last_affected": "7.3.1"
},
{
"introduced": "7.3.1.1"
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{
"last_affected": "7.3.1.1"
},
{
"introduced": "7.3.1.2"
},
{
"last_affected": "7.3.1.2"
},
{
"introduced": "7.4.0"
},
{
"last_affected": "7.4.0"
},
{
"introduced": "7.4.1"
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{
"last_affected": "7.4.1"
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{
"introduced": "7.4.1.1"
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{
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},
{
"introduced": "7.4.2"
},
{
"last_affected": "7.4.2"
},
{
"introduced": "7.4.2.1"
},
{
"last_affected": "7.4.2.1"
},
{
"introduced": "7.4.2.2"
},
{
"last_affected": "7.4.2.2"
},
{
"introduced": "7.4.2.3"
},
{
"last_affected": "7.4.2.3"
},
{
"introduced": "7.4.2.4"
},
{
"last_affected": "7.4.2.4"
},
{
"introduced": "7.4.3"
},
{
"last_affected": "7.4.3"
},
{
"introduced": "7.6.0"
},
{
"last_affected": "7.6.0"
},
{
"introduced": "7.6.1"
},
{
"last_affected": "7.6.1"
},
{
"introduced": "7.6.2"
},
{
"last_affected": "7.6.2"
},
{
"introduced": "7.6.2.1"
},
{
"last_affected": "7.6.2.1"
},
{
"introduced": "7.7.0"
},
{
"last_affected": "7.7.0"
},
{
"introduced": "7.7.10"
},
{
"last_affected": "7.7.10"
},
{
"introduced": "7.7.10.1"
},
{
"last_affected": "7.7.10.1"
}
],
"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:17.12.3:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.3a:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.4:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.4a:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.4b:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.5:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.5a:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.5b:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.5c:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.5d:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.6:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.13.1a:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.14.1a:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.15.1a:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.15.2a:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.15.2c:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.15.3:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.15.3a:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.15.4:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.15.4c:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.16.1a:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.17.1:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.18.1:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.18.1a:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.18.2:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.9.4:*:*:*:*:*:*:*",
"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.9.5e:*:*:*:*:*:*:*"
],
"vendor_product": "cisco:unified_threat_defense_snort_intrusion_prevention_system_engine",
"extracted_events": [
{
"range": [
{
"introduced": "17.9.4"
},
{
"last_affected": "17.9.4"
},
{
"introduced": "17.9.5e"
},
{
"last_affected": "17.9.5e"
},
{
"introduced": "17.12.1a"
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{
"last_affected": "17.12.1a"
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{
"introduced": "17.12.2"
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{
"last_affected": "17.12.2"
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{
"introduced": "17.12.3"
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{
"last_affected": "17.12.3"
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{
"introduced": "17.12.3a"
},
{
"last_affected": "17.12.3a"
},
{
"introduced": "17.12.4"
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{
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},
{
"introduced": "17.12.4a"
},
{
"last_affected": "17.12.4a"
},
{
"introduced": "17.12.4b"
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{
"last_affected": "17.12.4b"
},
{
"introduced": "17.12.5"
},
{
"last_affected": "17.12.5"
},
{
"introduced": "17.12.5a"
},
{
"last_affected": "17.12.5a"
},
{
"introduced": "17.12.5b"
},
{
"last_affected": "17.12.5b"
},
{
"introduced": "17.12.5c"
},
{
"last_affected": "17.12.5c"
},
{
"introduced": "17.12.5d"
},
{
"last_affected": "17.12.5d"
},
{
"introduced": "17.12.6"
},
{
"last_affected": "17.12.6"
},
{
"introduced": "17.13.1a"
},
{
"last_affected": "17.13.1a"
},
{
"introduced": "17.14.1a"
},
{
"last_affected": "17.14.1a"
},
{
"introduced": "17.15.1a"
},
{
"last_affected": "17.15.1a"
},
{
"introduced": "17.15.2a"
},
{
"last_affected": "17.15.2a"
},
{
"introduced": "17.15.2c"
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{
"last_affected": "17.15.2c"
},
{
"introduced": "17.15.3"
},
{
"last_affected": "17.15.3"
},
{
"introduced": "17.15.3a"
},
{
"last_affected": "17.15.3a"
},
{
"introduced": "17.15.4"
},
{
"last_affected": "17.15.4"
},
{
"introduced": "17.15.4c"
},
{
"last_affected": "17.15.4c"
},
{
"introduced": "17.16.1a"
},
{
"last_affected": "17.16.1a"
},
{
"introduced": "17.17.1"
},
{
"last_affected": "17.17.1"
},
{
"introduced": "17.18.1"
},
{
"last_affected": "17.18.1"
},
{
"introduced": "17.18.1a"
},
{
"last_affected": "17.18.1a"
},
{
"introduced": "17.18.2"
},
{
"last_affected": "17.18.2"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2026-20053",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 439466,
"published_at": "2026-03-04T18:16:19.607+00:00"
}