NULL pointer dereference in Cisco iOS Xe Software
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.
EPSS: 0.003 (17.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 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.
Affected products
- Cisco Ios Xe Software — versions 3.7.0S, 3.7.1S, 3.7.2S
- Cisco Ios — versions 15.2(5)EA, 15.2(4)M, 15.2(4)M8
- Cisco Ios_xe — versions 3.2.0se, 3.2.1se, 3.2.2se
Weakness classification (CWE)
References
- psirt@cisco.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2024-20312?
- CVE-2024-20312 is a high-severity vulnerability in Cisco iOS Xe Software, classified under NULL Pointer Dereference. CVSS score: 7.4/10. Published 2024-03-27.
- How severe is CVE-2024-20312?
- High severity. CVSS v3 base score is 7.4 out of 10.