7.4

CVE-2026-20074

Medienbericht
A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) multi-instance routing feature of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause the IS-IS process to restart unexpectedly.

This vulnerability is due to insufficient input validation of ingress IS-IS packets. An attacker could exploit this vulnerability by sending crafted IS-IS packets to an affected device after forming an adjacency. A successful exploit could allow the attacker to cause the IS-IS process to restart unexpectedly, resulting in a temporary loss of connectivity to advertised networks and a denial of service (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.  
Verknüpft mit AI von unstrukturierten Daten zu bestehenden CPE der NVD
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerCisco
≫
Produkt Cisco IOS XR Software
Default Statusunknown
Version 7.8.1
Status affected
Version 7.9.1
Status affected
Version 7.10.1
Status affected
Version 7.8.2
Status affected
Version 7.8.22
Status affected
Version 7.9.2
Status affected
Version 7.11.1
Status affected
Version 7.9.21
Status affected
Version 7.10.2
Status affected
Version 24.1.1
Status affected
Version 7.11.2
Status affected
Version 24.2.1
Status affected
Version 24.1.2
Status affected
Version 24.2.11
Status affected
Version 24.3.1
Status affected
Version 24.4.1
Status affected
Version 24.2.2
Status affected
Version 7.8.23
Status affected
Version 7.11.21
Status affected
Version 24.2.20
Status affected
Version 24.3.2
Status affected
Version 24.4.10
Status affected
Version 25.1.1
Status affected
Version 24.4.2
Status affected
Version 24.3.20
Status affected
Version 24.4.15
Status affected
Version 25.2.1
Status affected
Version 25.1.2
Status affected
Version 24.3.30
Status affected
Version 24.4.30
Status affected
Version 24.2.21
Status affected
Version 25.2.15
Status affected
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.02% 0.054
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
psirt@cisco.com 7.4 2.8 4
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-1287 Improper Validation of Specified Type of Input

The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.