CVE-2026-20308
Full vulnerability record from the local CVENow database.
Description
A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted input to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the web-based management interface to become unresponsive.
Severity
MEDIUM
CVSS score
4.3
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-08-05 17:16:51.280000
Last modified
2026-10-23 21:10:00.157000
View original CVE JSON
{
"id": "CVE-2026-20308",
"sourceIdentifier": "[email protected]",
"published": "2026-08-05T17:16:51.280",
"lastModified": "2026-10-23T21:10:00.157",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to perform a denial of service (DoS) attack against an affected device.\r\n\r\nThis vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted input to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the web-based management interface to become unresponsive."
},
{
"lang": "es",
"value": "Una vulnerabilidad en la interfaz de gestión basada en web del software Cisco IOS XE podría permitir a un atacante remoto autenticado con privilegios bajos realizar un ataque de denegación de servicio (DoS) contra un dispositivo afectado.\n\nEsta vulnerabilidad se debe a una validación de entrada insuficiente. Un atacante podría explotar esta vulnerabilidad enviando una entrada manipulada a la interfaz de gestión basada en web de un dispositivo afectado. Un exploit exitoso podría permitir al atacante hacer que la interfaz de gestión basada en web deje de responder."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Cisco",
"product": "Cisco IOS XE Software",
"defaultStatus": "unknown",
"versions": [
{
"version": "17.2.1a",
"status": "affected"
},
{
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},
{
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"status": "affected"
},
{
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"status": "affected"
},
{
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"status": "affected"
},
{
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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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{
"version": "17.3.1a",
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{
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{
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{
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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:L/UI:N/S:U/C:N/I:N/A:L",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "LOW"
},
"exploitabilityScore": 2.8,
"impactScore": 1.4
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-08-05T17:34:35.714176Z",
"id": "CVE-2026-20308",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-269"
}
]
}
],
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-dos-qdc7qx3",
"source": "[email protected]"
}
]
}