CVE-2026-20005 (GCVE-0-2026-20005)
Vulnerability from cvelistv5 – Published: 2026-03-04 17:02 – Updated: 2026-03-04 18:04
VLAI
EPSS
VEX
Summary
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 parsing of the SSL handshake ingress packets. An attacker could exploit this vulnerability by sending crafted SSL handshake packets. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine restarts unexpectedly.
Severity
5.8 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-04 17:18 UTC
CWE
- CWE-392 - Missing Report of Error Condition
Assigner
References
1 reference
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software |
Affected:
7.6.0
Affected: 7.6.1 Affected: 7.6.2 Affected: 7.6.2.1 Affected: 7.7.0 Affected: 7.7.10 Affected: 7.7.10.1 |
|
| Cisco | Cisco Cyber Vision |
Affected:
3.0.4
Affected: 3.0.0 Affected: 3.0.1 Affected: 3.0.2 Affected: 3.0.3 Affected: 3.0.5 Affected: 3.0.6 Affected: 3.1.0 Affected: 3.1.2 Affected: 3.1.1 Affected: 3.2.3 Affected: 3.2.1 Affected: 3.2.4 Affected: 3.2.0 Affected: 3.2.2 Affected: 4.0.0 Affected: 4.0.1 Affected: 4.0.2 Affected: 4.0.3 Affected: 4.1.0 Affected: 4.1.1 Affected: 4.1.2 Affected: 4.1.3 Affected: 4.1.4 Affected: 4.1.5 Affected: 4.1.6 Affected: 4.1.7 Affected: 4.2.0 Affected: 4.2.1 Affected: 4.2.4 Affected: 4.2.6 Affected: 4.2.2 Affected: 4.2.3 Affected: 4.3.0 Affected: 4.3.1 Affected: 4.3.2 Affected: 4.3.3 Affected: 4.4.0 Affected: 4.4.1 Affected: 4.4.2 Affected: 4.4.3 Affected: 5.0.0 Affected: 5.0.1 Affected: 5.0.2 Affected: 5.1.1 Affected: 5.1.2 Affected: 5.1.3 Affected: 5.2.0 Affected: 5.2.1 Affected: 5.3.0 Affected: 5.3.1 Affected: 5.3.2 |
|
| Cisco | Cisco UTD SNORT IPS Engine Software |
Affected:
17.2.1r
Affected: 17.3.1a Affected: 17.3.2 Affected: 17.3.3 Affected: 17.3.4a Affected: 17.3.6 Affected: 17.3.5 Affected: 17.3.7 Affected: 17.3.8 Affected: 17.4.1a Affected: 17.4.2 Affected: 17.4.1b Affected: 17.5.1a Affected: 17.6.1a Affected: 17.6.2 Affected: 17.6.3a Affected: 17.6.4 Affected: 17.6.5 Affected: 17.6.6 Affected: 17.6.7 Affected: 17.6.8a Affected: 17.7.1a Affected: 17.7.2 Affected: 17.10.1a Affected: 17.9.1a Affected: 17.9.2a Affected: 17.9.3a Affected: 17.9.4 Affected: 17.9.5a Affected: 17.9.6 Affected: 17.9.5e Affected: 17.9.5f Affected: 17.9.7a Affected: 17.9.8 Affected: 17.9.7b Affected: 17.8.1a Affected: 17.11.1a Affected: 17.12.1a Affected: 17.12.2 Affected: 17.12.3 Affected: 17.12.4 Affected: 17.12.4a Affected: 17.12.4b Affected: 17.12.5 Affected: 17.12.5a Affected: 17.12.5b Affected: 17.12.5c Affected: 17.12.6 Affected: 17.12.5d Affected: 17.13.1a Affected: 17.14.1a Affected: 17.15.1a Affected: 17.15.2a Affected: 17.15.2c Affected: 17.15.3 Affected: 17.15.3a Affected: 17.15.4 Affected: 17.15.4c Affected: 17.16.1a Affected: 17.17.1 Affected: 17.18.1a Affected: 17.18.2 |
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{
"status": "affected",
"version": "17.4.1a"
},
{
"status": "affected",
"version": "17.4.2"
},
{
"status": "affected",
"version": "17.4.1b"
},
{
"status": "affected",
"version": "17.5.1a"
},
{
"status": "affected",
"version": "17.6.1a"
},
{
"status": "affected",
"version": "17.6.2"
},
{
"status": "affected",
"version": "17.6.3a"
},
{
"status": "affected",
"version": "17.6.4"
},
{
"status": "affected",
"version": "17.6.5"
},
{
"status": "affected",
"version": "17.6.6"
},
{
"status": "affected",
"version": "17.6.7"
},
{
"status": "affected",
"version": "17.6.8a"
},
{
"status": "affected",
"version": "17.7.1a"
},
{
"status": "affected",
"version": "17.7.2"
},
{
"status": "affected",
"version": "17.10.1a"
},
{
"status": "affected",
"version": "17.9.1a"
},
{
"status": "affected",
"version": "17.9.2a"
},
{
"status": "affected",
"version": "17.9.3a"
},
{
"status": "affected",
"version": "17.9.4"
},
{
"status": "affected",
"version": "17.9.5a"
},
{
"status": "affected",
"version": "17.9.6"
},
{
"status": "affected",
"version": "17.9.5e"
},
{
"status": "affected",
"version": "17.9.5f"
},
{
"status": "affected",
"version": "17.9.7a"
},
{
"status": "affected",
"version": "17.9.8"
},
{
"status": "affected",
"version": "17.9.7b"
},
{
"status": "affected",
"version": "17.8.1a"
},
{
"status": "affected",
"version": "17.11.1a"
},
{
"status": "affected",
"version": "17.12.1a"
},
{
"status": "affected",
"version": "17.12.2"
},
{
"status": "affected",
"version": "17.12.3"
},
{
"status": "affected",
"version": "17.12.4"
},
{
"status": "affected",
"version": "17.12.4a"
},
{
"status": "affected",
"version": "17.12.4b"
},
{
"status": "affected",
"version": "17.12.5"
},
{
"status": "affected",
"version": "17.12.5a"
},
{
"status": "affected",
"version": "17.12.5b"
},
{
"status": "affected",
"version": "17.12.5c"
},
{
"status": "affected",
"version": "17.12.6"
},
{
"status": "affected",
"version": "17.12.5d"
},
{
"status": "affected",
"version": "17.13.1a"
},
{
"status": "affected",
"version": "17.14.1a"
},
{
"status": "affected",
"version": "17.15.1a"
},
{
"status": "affected",
"version": "17.15.2a"
},
{
"status": "affected",
"version": "17.15.2c"
},
{
"status": "affected",
"version": "17.15.3"
},
{
"status": "affected",
"version": "17.15.3a"
},
{
"status": "affected",
"version": "17.15.4"
},
{
"status": "affected",
"version": "17.15.4c"
},
{
"status": "affected",
"version": "17.16.1a"
},
{
"status": "affected",
"version": "17.17.1"
},
{
"status": "affected",
"version": "17.18.1a"
},
{
"status": "affected",
"version": "17.18.2"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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.\r\n\r This vulnerability is due to incomplete parsing of the SSL handshake ingress packets. An attacker could exploit this vulnerability by sending crafted SSL handshake packets. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine restarts unexpectedly."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."
}
],
"metrics": [
{
"cvssV3_1": {
"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"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-392",
"description": "Missing Report of Error Condition",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-04T17:31:57.391Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-snort3-multi-dos-XFWkWSwz",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz"
}
],
"source": {
"advisory": "cisco-sa-snort3-multi-dos-XFWkWSwz",
"defects": [
"CSCwo93207",
"CSCwn65473",
"CSCwp99280",
"CSCwo93208"
],
"discovery": "EXTERNAL"
}
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20005",
"datePublished": "2026-03-04T17:02:45.919Z",
"dateReserved": "2025-10-08T11:59:15.349Z",
"dateUpdated": "2026-03-04T18:04:14.731Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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