CVE-2026-20221
Full vulnerability record from the local CVENow database.
Description
Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause an unexpected restart of the Snort 3 Detection Engine. This vulnerability is due to improper handling of nested GRE traffic. An attacker could exploit this vulnerability by sending a crafted GRE payload through an affected device. A successful exploit could allow the attacker to trigger an unexpected reload of the Snort 3 Detection Engine, resulting in either a bypass or denial of service (DoS) condition, depending on device configuration. For more information, see the section of this advisory. The Snort 3 Detection Engine will restart automatically. No manual intervention is required.
Severity
MEDIUM
CVSS score
5.8
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-10-21 17:18:27.947000
Last modified
2026-10-22 14:17:40.940000
View original CVE JSON
{
"id": "CVE-2026-20221",
"sourceIdentifier": "[email protected]",
"published": "2026-10-21T17:18:27.947",
"lastModified": "2026-10-22T14:17:40.940",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause an unexpected restart of the Snort 3 Detection Engine.\r\n\r\nThis vulnerability is due to improper handling of nested GRE traffic. An attacker could exploit this vulnerability by sending a crafted GRE payload through an affected device. A successful exploit could allow the attacker to trigger an unexpected reload of the Snort 3 Detection Engine, resulting in either a bypass or denial of service (DoS) condition, depending on device configuration. For more information, see the section of this advisory. The Snort 3 Detection Engine will restart automatically. No manual intervention is required."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
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"product": "Cisco Cyber Vision",
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"status": "affected"
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{
"version": "2.1.4",
"status": "affected"
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{
"version": "2.1.5",
"status": "affected"
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{
"version": "2.2",
"status": "affected"
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{
"version": "2.2.1",
"status": "affected"
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{
"version": "2.3",
"status": "affected"
},
{
"version": "2.3.1",
"status": "affected"
},
{
"version": "2.4",
"status": "affected"
},
{
"version": "2.4.4",
"status": "affected"
},
{
"version": "2.4.6",
"status": "affected"
},
{
"version": "2.8.9",
"status": "affected"
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{
"version": "3.0",
"status": "affected"
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{
"version": "3.1",
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{
"version": "3.2",
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{
"version": "2.8.1",
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{
"version": "2.8.2",
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{
"version": "2.8.3",
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{
"version": "2.8.4",
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{
"version": "2.8.5",
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{
"version": "3.0.1",
"status": "affected"
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{
"version": "3.0.2",
"status": "affected"
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{
"version": "3.0.4",
"status": "affected"
},
{
"version": "3.0.5",
"status": "affected"
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{
"version": "3.1.1",
"status": "affected"
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{
"version": "3.1.2",
"status": "affected"
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{
"version": "3.1.3",
"status": "affected"
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{
"version": "3.1.4",
"status": "affected"
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{
"version": "3.2.1",
"status": "affected"
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{
"version": "3.2.2",
"status": "affected"
},
{
"version": "3.2.3",
"status": "affected"
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{
"version": "3.3",
"status": "affected"
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{
"version": "3.3.1",
"status": "affected"
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{
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{
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]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
"baseScore": 5.8,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "CHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "LOW"
},
"exploitabilityScore": 3.9,
"impactScore": 1.4
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-10-22T13:23:54.810399Z",
"id": "CVE-2026-20221",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-476"
}
]
}
],
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-gre-JNpMHrTv",
"source": "[email protected]"
}
]
}