EN

CVE-2024-20312

High
7.4
0.05.010.0
Year
2024
Published
Mar 27, 2024
Known Affected Devices
0
CVSS Score
7.4

What is CVE-2024-20312?

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.

CVSS Vector Breakdown

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

Exploitable from an adjacent network (e.g. same LAN, Wi-Fi segment, Bluetooth).

AC
Attack Complexity
Low

No special conditions required. Exploit can be performed reliably and repeatedly.

PR
Privileges Required
None

No authentication required. Any anonymous user can exploit this vulnerability.

UI
User Interaction
None

No user interaction required. Exploit runs without any victim action.

S
Scope
Changed

Exploiting the vulnerability can affect other components beyond the vulnerable one.

C
Confidentiality Impact
None

No confidentiality impact. Sensitive data is not exposed.

I
Integrity Impact
None

No integrity impact. Data cannot be modified.

A
Availability Impact
High

Complete denial of service. The component becomes fully unavailable.

Known Affected Devices

Cisco Cisco ISR 4451 Cisco Cisco ISR 4461 Cisco Cisco ISR 927 Cisco Cisco ISR 951 Cisco Cisco ASR 1002-X Cisco Cisco ASR 1002-HX Cisco Cisco ASR 1004 Cisco Cisco ASR 9001 Cisco Cisco ASR 9010 Cisco Cisco ASR 9901 Cisco Cisco Catalyst 2960-24TC-L Cisco Cisco Catalyst 2960X-24PSQ-L Cisco Cisco Catalyst 2960X-48FPS-L Cisco Cisco Catalyst 3560CX-8PC-S Cisco Cisco Catalyst 9200-24P Cisco Cisco Catalyst 9200-24T Cisco Cisco Catalyst 9200-48P Cisco Cisco Catalyst 9200L-48P-4X Cisco Cisco Catalyst 9300-24P Cisco Cisco Catalyst 9300-48U Cisco Cisco Catalyst 9300-48UXM Cisco Cisco Catalyst 9300L-24T-4G Cisco Cisco Catalyst 9407R Cisco Cisco Catalyst 9500-24Y4C Cisco Cisco Catalyst 9500-40X Cisco Cisco Nexus 7004 Cisco Cisco Nexus 9364C Cisco Cisco Nexus 9508 Cisco Cisco ASA 5508-X Cisco Cisco ASA 5515-X Cisco Cisco Firepower 2130 Cisco Cisco Firepower 4140 Cisco Cisco Firepower 4150 Cisco Cisco Aironet 1815M Cisco Cisco Aironet 3802I Cisco Cisco Catalyst 9115AXE Cisco Cisco Catalyst 9120AXI Cisco Cisco Catalyst 9120AXE Cisco Cisco Catalyst 9130AXI Cisco Cisco Catalyst 9800-40 Cisco Cisco Catalyst 9800-L-F

FAQ

How severe is CVE-2024-20312?

CVE-2024-20312 has a CVSS score of 7.4/10, rated as High. This is a high severity vulnerability and should be patched as soon as possible.

What does the CVSS score mean for CVE-2024-20312?

CVSS (Common Vulnerability Scoring System) rates vulnerability severity from 0.0 to 10.0. CVE-2024-20312 scores 7.4/10 (High). Scores 9.0–10.0 are Critical, 7.0–8.9 are High, 4.0–6.9 are Medium, and below 4.0 are Low.

Which devices are affected by CVE-2024-20312?

The list of devices confirmed to be affected by CVE-2024-20312 is shown in the "Affected Devices" section above. Check your firmware version against the vendor security advisory and apply the latest patch.

How do I fix or mitigate CVE-2024-20312?

Apply the latest firmware or software update from the vendor. Check the References section above for official advisories and patch notes. If no patch is available, consider disabling the affected feature or isolating the device from untrusted networks.