FKIE_CVE-2025-20339
Vulnerability from fkie_nvd - Published: 2025-09-24 17:15 - Updated: 2026-09-26 00:10
Severity
Summary
A vulnerability in the access control list (ACL) processing of IPv4 packets of Cisco SD-WAN vEdge Software could allow an unauthenticated, remote attacker to bypass a configured ACL.
This vulnerability is due to the improper enforcement of the implicit deny all at the end of a configured ACL. An attacker could exploit this vulnerability by attempting to send unauthorized traffic to an interface on an affected device. A successful exploit could allow the attacker to bypass an ACL on the affected device.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unknown",
"product": "Cisco SD-WAN vEdge Cloud",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "20.9.1"
},
{
"status": "affected",
"version": "20.9.1.1"
},
{
"status": "affected",
"version": "20.9.2"
},
{
"status": "affected",
"version": "20.9.3"
},
{
"status": "affected",
"version": "20.9.3.1"
},
{
"status": "affected",
"version": "20.9.2.2"
},
{
"status": "affected",
"version": "20.9.2.3"
},
{
"status": "affected",
"version": "20.9.4"
},
{
"status": "affected",
"version": "20.9.5"
},
{
"status": "affected",
"version": "20.9.5.1"
},
{
"status": "affected",
"version": "20.9.6"
},
{
"status": "affected",
"version": "20.9.5.3"
}
]
},
{
"defaultStatus": "unknown",
"product": "Cisco SD-WAN vEdge Router",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "20.3.1"
},
{
"status": "affected",
"version": "20.3.2"
},
{
"status": "affected",
"version": "20.4.1"
},
{
"status": "affected",
"version": "20.4.1.1"
},
{
"status": "affected",
"version": "20.3.3"
},
{
"status": "affected",
"version": "20.4.1.2"
},
{
"status": "affected",
"version": "20.4.2"
},
{
"status": "affected",
"version": "20.3.4"
},
{
"status": "affected",
"version": "20.3.5"
},
{
"status": "affected",
"version": "20.9.1"
},
{
"status": "affected",
"version": "20.3.6"
},
{
"status": "affected",
"version": "20.9.2"
},
{
"status": "affected",
"version": "20.3.7"
},
{
"status": "affected",
"version": "20.9.3"
},
{
"status": "affected",
"version": "20.3.3.2"
},
{
"status": "affected",
"version": "20.3.4.3"
},
{
"status": "affected",
"version": "20.9.3.1"
},
{
"status": "affected",
"version": "20.3.7.1"
},
{
"status": "affected",
"version": "20.3.5.1"
},
{
"status": "affected",
"version": "20.4.2.3"
},
{
"status": "affected",
"version": "20.9.2.2"
},
{
"status": "affected",
"version": "20.3.7.2"
},
{
"status": "affected",
"version": "20.9.2.3"
},
{
"status": "affected",
"version": "20.9.4"
},
{
"status": "affected",
"version": "20.12.1"
},
{
"status": "affected",
"version": "20.3.8"
},
{
"status": "affected",
"version": "20.9.4.1777"
},
{
"status": "affected",
"version": "20.9.5"
},
{
"status": "affected",
"version": "20.9.5.1"
},
{
"status": "affected",
"version": "20.12.3.1"
},
{
"status": "affected",
"version": "20.9.6"
},
{
"status": "affected",
"version": "20.9.5.3"
}
]
}
],
"source": "psirt@cisco.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the access control list (ACL) processing of IPv4 packets of Cisco SD-WAN vEdge Software could allow an unauthenticated, remote attacker to bypass a configured ACL.\r\n\r\nThis vulnerability is due to the improper enforcement of the implicit deny all at the end of a configured ACL. An attacker could exploit this vulnerability by attempting to send unauthorized traffic to an interface on an affected device. A successful exploit could allow the attacker to bypass an ACL on the affected device."
},
{
"lang": "es",
"value": "Una vulnerabilidad en el procesamiento de la lista de control de acceso (ACL) de paquetes IPv4 del software Cisco SD-WAN vEdge podr\u00eda permitir a un atacante remoto no autenticado eludir una ACL configurada.\n\nEsta vulnerabilidad se debe a la aplicaci\u00f3n incorrecta del \u201cdenegar todo\u201d impl\u00edcito al final de una ACL configurada. Un atacante podr\u00eda explotar esta vulnerabilidad al intentar enviar tr\u00e1fico no autorizado a una interfaz en un dispositivo afectado. Un exploit exitoso podr\u00eda permitir al atacante eludir una ACL en el dispositivo afectado."
}
],
"id": "CVE-2025-20339",
"lastModified": "2026-09-26T00:10:00.127",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 1.4,
"source": "psirt@cisco.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2025-20339",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-09-24T17:03:59.125030Z",
"version": "2.0.3"
}
}
]
},
"published": "2025-09-24T17:15:40.523",
"references": [
{
"source": "psirt@cisco.com",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-defaultacl-pSJk9nVF"
}
],
"sourceIdentifier": "psirt@cisco.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-284"
}
],
"source": "psirt@cisco.com",
"type": "Secondary"
}
]
}
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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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