CVE-2023-20169 : A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) protoc

A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco NX-OS Software for the Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the IS-IS process to unexpectedly restart, which could cause an affected device to reload. This vulnerability is due to insufficient input validation when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device. A successful exploit could allow the attacker to cause a denial of service (DoS) condition due to the unexpected restart of the IS-IS process, which could cause the affected device to reload. Note: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2 adjacent to the affected device.

Published 2023-08-23 19:15:08

Updated 2024-01-25 17:15:32

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Input validationDenial of service

Products affected by CVE-2023-20169

Cisco » Nx-os » Version: 10.3(2)
cpe:2.3:o:cisco:nx-os:10.3\(2\):*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Nexus 3048 » Version: N/A
When used together with: Cisco » Nexus 31108pc-v » Version: N/A
When used together with: Cisco » Nexus 31108tc-v » Version: N/A
When used together with: Cisco » Nexus 31128pq » Version: N/A
When used together with: Cisco » Nexus 3132c-z » Version: N/A
When used together with: Cisco » Nexus 3132q-v » Version: N/A
When used together with: Cisco » Nexus 3132q-xl » Version: N/A
When used together with: Cisco » Nexus 3164q » Version: N/A
When used together with: Cisco » Nexus 3172pq » Version: N/A
When used together with: Cisco » Nexus 3172pq-xl » Version: N/A
When used together with: Cisco » Nexus 3172tq » Version: N/A
When used together with: Cisco » Nexus 3172tq-32t » Version: N/A
When used together with: Cisco » Nexus 3172tq-xl » Version: N/A
When used together with: Cisco » Nexus 3232 » Version: N/A
When used together with: Cisco » Nexus 3264c-e » Version: N/A
When used together with: Cisco » Nexus 3264q » Version: N/A
When used together with: Cisco » Nexus 3408-s » Version: N/A
When used together with: Cisco » Nexus 34180yc » Version: N/A
When used together with: Cisco » Nexus 34200yc-sm » Version: N/A
When used together with: Cisco » Nexus 3432d-s » Version: N/A
When used together with: Cisco » Nexus 3464c » Version: N/A
When used together with: Cisco » Nexus 3524 » Version: N/A
When used together with: Cisco » Nexus 3524-x » Version: N/A
When used together with: Cisco » Nexus 3524-xl » Version: N/A
When used together with: Cisco » Nexus 3548 » Version: N/A
When used together with: Cisco » Nexus 3548-x » Version: N/A
When used together with: Cisco » Nexus 3548-xl » Version: N/A
When used together with: Cisco » Nexus 36180yc-r » Version: N/A
When used together with: Cisco » Nexus 9232e » Version: N/A
When used together with: Cisco » Nexus 92348gc-x » Version: N/A
When used together with: Cisco » Nexus 9408 » Version: N/A
When used together with: Cisco » Nexus 9504 » Version: N/A
When used together with: Cisco » Nexus 9508 » Version: N/A
When used together with: Cisco » Nexus 9516 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2023-20169

EPSS FAQ

0.19%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 57 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-20169

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.4	HIGH	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	2.8	4.0	NIST
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High
6.5	MEDIUM	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	2.8	3.6	NIST
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High
7.4	HIGH	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	2.8	4.0	Cisco Systems, Inc.
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2023-20169

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Assigned by: nvd@nist.gov (Primary)
CWE-788 Access of Memory Location After End of Buffer

The product reads or writes to a buffer using an index or pointer that references a memory location after the end of the buffer.

Assigned by: ykramarz@cisco.com (Secondary)

References for CVE-2023-20169

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-n3_9k-isis-dos-FTCXB4Vb

Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol Denial of Service Vulnerability
Vendor Advisory

Jump to

Vulnerability Details : CVE-2023-20169

Products affected by CVE-2023-20169

Exploit prediction scoring system (EPSS) score for CVE-2023-20169

CVSS scores for CVE-2023-20169

CWE ids for CVE-2023-20169

References for CVE-2023-20169