NVD

CVE-2024-20312 Detail

Modified

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

Description

A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS Software and Cisco IOS XE 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 when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device after forming an adjacency. A successful exploit could allow the attacker to cause the affected device to reload, resulting in 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 have formed an adjacency.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

Nist CVSS score does not match with CNA score

CNA: Cisco Systems, Inc.

Base Score: 7.4 HIGH

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-isis-sGjyOUHX	CVE, Cisco Systems, Inc.	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-476	NULL Pointer Dereference	Cisco Systems, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

6 change records found show changes

Initial Analysis by NIST 6/30/2025 11:21:14 AM

Action	Type	New Value
Added	CPE Configuration	Record truncated, showing 2048 of 23577 characters. View Entire Change Record OR cpe:2.3:o:cisco:ios:15.2(4)ea::::::: cpe:2.3:o:cisco:ios:15.4(2)s2::::::: cpe:2.3:o:cisco:ios:15.3(2)s1::::::: cpe:2.3:o:cisco:ios:15.1(2)sy10::::::: cpe:2.3:o:cisco:ios:15.5(1)t1::::::: cpe:2.3:o:cisco:ios:15.4(2)s4::::::: cpe:2.3:o:cisco:ios:15.1(2)sg1::::::: cpe:2.3:o:cisco:ios:15.1(2)sg4::::::: cpe:2.3:o:cisco:ios:15.2(4)m7::::::: cpe:2.3:o:cisco:ios:15.3(2)s::::::: cpe:2.3:o:cisco:ios:15.2(3)e2::::::: cpe:2.3:o:cisco:ios:15.2(2)e5b::::::: cpe:2.3:o:cisco:ios:15.2(2)sy::::::: cpe:2.3:o:cisco:ios:15.5(3)s1a::::::: cpe:2.3:o:cisco:ios:15.5(3)m4a::::::: cpe:2.3:o:cisco:ios:15.6(1)t2::::::: cpe:2.3:o:cisco:ios:15.6(2)t3::::::: cpe:2.3:o:cisco:ios:15.6(2)sp2::::::: cpe:2.3:o:cisco:ios:15.2(2)s1::::::: cpe:2.3:o:cisco:ios:15.2(4)s7::::::: cpe:2.3:o:cisco:ios:15.3(2)t::::::: cpe:2.3:o:cisco:ios:15.3(1)t4::::::: cpe:2.3:o:cisco:ios:15.3(2)t2::::::: cpe:2.3:o:cisco:ios:15.1(2)sy3::::::: cpe:2.3:o:cisco:ios:15.3(3)s5::::::: cpe:2.3:o:cisco:ios:15.4(1)t2::::::: cpe:2.3:o:cisco:ios:15.4(2)t1::::::: cpe:2.3:o:cisco:ios:15.2(1)e2::::::: cpe:2.3:o:cisco:ios:15.2(2)e3::::::: cpe:2.3:o:cisco:ios:15.2(3)e4::::::: cpe:2.3:o:cisco:ios:15.2(2)e6::::::: cpe:2.3:o:cisco:ios:15.4(3)s4::::::: cpe:2.3:o:cisco:ios:15.2(1)sy::::::: cpe:2.3:o:cisco:ios:15.2(1)sy1a::::::: cpe:2.3:o:cisco:ios:15.5(1)s2::::::: cpe:2.3:o:cisco:ios:15.5(1)t3::::::: cpe:2.3:o:cisco:ios:15.2(4)ea4:::::::
Added	CPE Configuration	Record truncated, showing 2048 of 21540 characters. View Entire Change Record OR cpe:2.3:o:cisco:ios_xe:3.13.2s::::::: cpe:2.3:o:cisco:ios_xe:3.10.6s::::::: cpe:2.3:o:cisco:ios_xe:3.6.5be::::::: cpe:2.3:o:cisco:ios_xe:3.13.6s::::::: cpe:2.3:o:cisco:ios_xe:3.14.4s::::::: cpe:2.3:o:cisco:ios_xe:3.7.2ts::::::: cpe:2.3:o:cisco:ios_xe:3.4.1sg::::::: cpe:2.3:o:cisco:ios_xe:3.13.0s::::::: cpe:2.3:o:cisco:ios_xe:3.13.4s::::::: cpe:2.3:o:cisco:ios_xe:3.6.5ae::::::: cpe:2.3:o:cisco:ios_xe:3.15.1cs::::::: cpe:2.3:o:cisco:ios_xe:3.7.1e::::::: cpe:2.3:o:cisco:ios_xe:3.7.4e::::::: cpe:2.3:o:cisco:ios_xe:16.1.3::::::: cpe:2.3:o:cisco:ios_xe:16.2.1::::::: cpe:2.3:o:cisco:ios_xe:3.8.3e::::::: cpe:2.3:o:cisco:ios_xe:3.18.2s::::::: cpe:2.3:o:cisco:ios_xe:3.9.0e::::::: cpe:2.3:o:cisco:ios_xe:3.7.1s::::::: cpe:2.3:o:cisco:ios_xe:3.8.0s::::::: cpe:2.3:o:cisco:ios_xe:3.8.1s::::::: cpe:2.3:o:cisco:ios_xe:3.9.0s::::::: cpe:2.3:o:cisco:ios_xe:3.9.1as::::::: cpe:2.3:o:cisco:ios_xe:3.9.0as::::::: cpe:2.3:o:cisco:ios_xe:3.3.4se::::::: cpe:2.3:o:cisco:ios_xe:3.3.5se::::::: cpe:2.3:o:cisco:ios_xe:3.4.2sg::::::: cpe:2.3:o:cisco:ios_xe:3.4.4sg::::::: cpe:2.3:o:cisco:ios_xe:3.5.1e::::::: cpe:2.3:o:cisco:ios_xe:3.10.1s::::::: cpe:2.3:o:cisco:ios_xe:3.10.5s::::::: cpe:2.3:o:cisco:ios_xe:3.10.8s::::::: cpe:2.3:o:cisco:ios_xe:3.12.2s::::::: cpe:2.3:o:cisco:ios_xe:3.6.0e::::::: cpe:2.3:o:cisco:ios_xe:3.6.4e::::::: cpe:2.3:o:cisco:ios_xe:3.6.6e::::::: *cpe:2.3:o:cisco:ios_xe:3.14.1s:
Added	Reference Type	CVE: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-isis-sGjyOUHX Types: Vendor Advisory
Added	Reference Type	Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-isis-sGjyOUHX Types: Vendor Advisory

New CVE Received from Cisco Systems, Inc. 3/27/2024 1:15:52 PM

Action	Type	New Value
Added	Description	A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS Software and Cisco IOS XE 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 when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device after forming an adjacency. A successful exploit could allow the attacker to cause the affected device to reload, resulting in 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 have formed an adjacency.
Added	CVSS V3.1	Cisco Systems, Inc. AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Added	CWE	Cisco Systems, Inc. CWE-476
Added	Reference	Cisco Systems, Inc. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-isis-sGjyOUHX [No types assigned]

Quick Info

CVE Dictionary Entry:
CVE-2024-20312
NVD Published Date:
03/27/2024
NVD Last Modified:
08/26/2025
Source:
Cisco Systems, Inc.

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