CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS
Percentile
9.6%
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.
This 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.
Note: 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.
[
{
"vendor": "Cisco",
"product": "Cisco IOS XR Software",
"versions": [
{
"version": "7.4.1",
"status": "affected"
},
{
"version": "6.8.1",
"status": "affected"
},
{
"version": "7.4.15",
"status": "affected"
},
{
"version": "7.5.1",
"status": "affected"
},
{
"version": "7.4.16",
"status": "affected"
},
{
"version": "7.6.1",
"status": "affected"
},
{
"version": "7.5.2",
"status": "affected"
},
{
"version": "7.8.1",
"status": "affected"
},
{
"version": "7.6.15",
"status": "affected"
},
{
"version": "7.5.12",
"status": "affected"
},
{
"version": "7.7.1",
"status": "affected"
},
{
"version": "6.8.2",
"status": "affected"
},
{
"version": "7.4.2",
"status": "affected"
},
{
"version": "6.9.1",
"status": "affected"
},
{
"version": "7.6.2",
"status": "affected"
},
{
"version": "7.5.3",
"status": "affected"
},
{
"version": "7.7.2",
"status": "affected"
},
{
"version": "6.9.2",
"status": "affected"
},
{
"version": "7.9.1",
"status": "affected"
},
{
"version": "7.10.1",
"status": "affected"
},
{
"version": "7.8.2",
"status": "affected"
},
{
"version": "7.5.4",
"status": "affected"
},
{
"version": "7.8.22",
"status": "affected"
},
{
"version": "7.7.21",
"status": "affected"
},
{
"version": "7.9.2",
"status": "affected"
},
{
"version": "7.5.5",
"status": "affected"
},
{
"version": "7.11.1",
"status": "affected"
},
{
"version": "7.9.21",
"status": "affected"
},
{
"version": "7.10.2",
"status": "affected"
},
{
"version": "7.6.3",
"status": "affected"
}
],
"defaultStatus": "unknown"
}
]