7.4 CVE-2026-20074

Enriched by CISA
 

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.  
https://nvd.nist.gov/vuln/detail/CVE-2026-20074

Categories

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. Large language model (LLM) management tool does notvalidate the format of a digest value (CWE-1287) from aprivate, untrusted model registry, enabling relativepath traversal (CWE-23), a.k.a. Probllama SQL injection through an ID that was supposed to be numeric.

References


 

AFFECTED (from MITRE)

Vendor Product Versions
Cisco Cisco IOS XR Software
  • 7.8.1 [affected]
  • 7.9.1 [affected]
  • 7.10.1 [affected]
  • 7.8.2 [affected]
  • 7.8.22 [affected]
  • 7.9.2 [affected]
  • 7.11.1 [affected]
  • 7.9.21 [affected]
  • 7.10.2 [affected]
  • 24.1.1 [affected]
  • 7.11.2 [affected]
  • 24.2.1 [affected]
  • 24.1.2 [affected]
  • 24.2.11 [affected]
  • 24.3.1 [affected]
  • 24.4.1 [affected]
  • 24.2.2 [affected]
  • 7.8.23 [affected]
  • 7.11.21 [affected]
  • 24.2.20 [affected]
  • 24.3.2 [affected]
  • 24.4.10 [affected]
  • 25.1.1 [affected]
  • 24.4.2 [affected]
  • 24.3.20 [affected]
  • 24.4.15 [affected]
  • 25.2.1 [affected]
  • 25.1.2 [affected]
  • 24.3.30 [affected]
  • 24.4.30 [affected]
  • 24.2.21 [affected]
  • 25.2.15 [affected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe start end

REMEDIATION


EXPLOITS

Exploit-db.com

id description date
No known exploits

POC Github

Url
No known exploits

Other Nist (github, ...)

Url
No known exploits

CAPEC

Common Attack Pattern Enumerations and Classifications

id description severity
No entry