FKIE_CVE-2023-27516
Vulnerability from fkie_nvd - Published: 2023-10-12 16:15 - Updated: 2026-06-17 05:45
Severity
7.3 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/
Summary
An authentication bypass vulnerability exists in the CiRpcAccepted() functionality of SoftEther VPN 4.41-9782-beta and 5.01.9674. A specially crafted network packet can lead to unauthorized access. An attacker can send a network request to trigger this vulnerability.
References
{
"affected": [
{
"affectedData": [
{
"product": "SoftEther VPN",
"vendor": "SoftEther VPN",
"versions": [
{
"status": "affected",
"version": "4.41-9782-beta"
},
{
"status": "affected",
"version": "5.01.9674"
}
]
}
],
"source": "talos-cna@cisco.com"
},
{
"affectedData": [
{
"cpes": [
"cpe:2.3:a:softether:vpn:4.41-9782:beta:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "vpn",
"vendor": "softether",
"versions": [
{
"status": "affected",
"version": "4.41-9782"
}
]
},
{
"cpes": [
"cpe:2.3:a:softether:vpn:5.01.9674:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "vpn",
"vendor": "softether",
"versions": [
{
"status": "affected",
"version": "5.01.9674"
}
]
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:softether:vpn:4.41-9782:beta:*:*:*:*:*:*",
"matchCriteriaId": "79C47EE5-1B55-4FDD-A5B5-E10FF3337100",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:softether:vpn:5.01.9674:*:*:*:*:*:*:*",
"matchCriteriaId": "5CF5CF13-B22F-494B-BDC0-B59371979251",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "An authentication bypass vulnerability exists in the CiRpcAccepted() functionality of SoftEther VPN 4.41-9782-beta and 5.01.9674. A specially crafted network packet can lead to unauthorized access. An attacker can send a network request to trigger this vulnerability."
},
{
"lang": "es",
"value": "Existe una vulnerabilidad de omisi\u00f3n de autenticaci\u00f3n en la funcionalidad CiRpcAccepted() de SoftEther VPN 4.41-9782-beta y 5.01.9674. Un paquete de red especialmente manipulado puede provocar un acceso no autorizado. Un atacante puede enviar una solicitud de red para desencadenar esta vulnerabilidad."
}
],
"id": "CVE-2023-27516",
"lastModified": "2026-06-17T05:45:22.517",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
"version": "3.1"
},
"exploitabilityScore": 2.5,
"impactScore": 4.7,
"source": "talos-cna@cisco.com",
"type": "Secondary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2023-27516",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-08-01T15:14:30.646891Z",
"version": "2.0.3"
}
}
]
},
"published": "2023-10-12T16:15:11.670",
"references": [
{
"source": "talos-cna@cisco.com",
"tags": [
"Exploit",
"Third Party Advisory"
],
"url": "https://talosintelligence.com/vulnerability_reports/TALOS-2023-1754"
},
{
"source": "talos-cna@cisco.com",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "https://www.softether.org/9-about/News/904-SEVPN202301"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit",
"Third Party Advisory"
],
"url": "https://talosintelligence.com/vulnerability_reports/TALOS-2023-1754"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "https://www.softether.org/9-about/News/904-SEVPN202301"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1754"
}
],
"sourceIdentifier": "talos-cna@cisco.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-453"
}
],
"source": "talos-cna@cisco.com",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-1188"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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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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