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{
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"data_version" : "4.0" ,
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"data_type" : "CVE" ,
"data_format" : "MITRE" ,
"CVE_data_meta" : {
"ID" : "CVE-2024-20406" ,
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"ASSIGNER" : "psirt@cisco.com" ,
"STATE" : "PUBLIC"
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} ,
"description" : {
"description_data" : [
{
"lang" : "eng" ,
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"value" : "A vulnerability in the segment routing feature for the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to insufficient input validation of ingress IS-IS packets. An attacker could exploit this vulnerability by sending specific IS-IS packets to an affected device after forming an adjacency. A successful exploit could allow the attacker to cause the IS-IS process on all affected devices that are participating in the Flexible Algorithm to crash and restart, resulting in a DoS condition.\r\nNote: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device and must have formed an adjacency. This vulnerability affects segment routing for IS-IS over IPv4 and IPv6 control planes as well as devices that are configured as level 1, level 2, or multi-level routing IS-IS type."
}
]
} ,
"problemtype" : {
"problemtype_data" : [
{
"description" : [
{
"lang" : "eng" ,
"value" : "Improper Input Validation" ,
"cweId" : "CWE-20"
}
]
}
]
} ,
"affects" : {
"vendor" : {
"vendor_data" : [
{
"vendor_name" : "Cisco" ,
"product" : {
"product_data" : [
{
"product_name" : "Cisco IOS XR Software" ,
"version" : {
"version_data" : [
{
"version_affected" : "=" ,
"version_value" : "7.4.1"
} ,
{
"version_affected" : "=" ,
"version_value" : "6.8.1"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.4.15"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.5.1"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.4.16"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.6.1"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.5.2"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.8.1"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.6.15"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.5.12"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.7.1"
} ,
{
"version_affected" : "=" ,
"version_value" : "6.8.2"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.4.2"
} ,
{
"version_affected" : "=" ,
"version_value" : "6.9.1"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.6.2"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.5.3"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.7.2"
} ,
{
"version_affected" : "=" ,
"version_value" : "6.9.2"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.9.1"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.10.1"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.8.2"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.5.4"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.8.22"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.7.21"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.9.2"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.5.5"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.11.1"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.9.21"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.10.2"
} ,
{
"version_affected" : "=" ,
"version_value" : "7.6.3"
}
]
}
}
]
}
}
]
}
} ,
"references" : {
"reference_data" : [
{
"url" : "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-isis-xehpbVNe" ,
"refsource" : "MISC" ,
"name" : "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-isis-xehpbVNe"
}
]
} ,
"source" : {
"advisory" : "cisco-sa-isis-xehpbVNe" ,
"discovery" : "EXTERNAL" ,
"defects" : [
"CSCwi39542"
]
} ,
"exploit" : [
{
"lang" : "en" ,
"value" : "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
}
] ,
"impact" : {
"cvss" : [
{
"version" : "3.1" ,
"vectorString" : "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H" ,
"baseScore" : 7.4 ,
"baseSeverity" : "HIGH" ,
"attackVector" : "ADJACENT_NETWORK" ,
"attackComplexity" : "LOW" ,
"privilegesRequired" : "NONE" ,
"userInteraction" : "NONE" ,
"scope" : "CHANGED" ,
"confidentialityImpact" : "NONE" ,
"integrityImpact" : "NONE" ,
"availabilityImpact" : "HIGH"
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}
]
}
}
