Integer overflow in Cisco iOS Xe Software
CVE-2024-20434
A vulnerability in Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on the control plane of an affected device. This vulnerability is due to improper handling of frames with VLAN tag information. An attacker could exploit this vulnerability by sending crafted frames to an affected device. A successful exploit could allow the attacker to render the control plane of the affected device unresponsive. The device would not be accessible through the console or CLI, and it would not respond to ping requests, SNMP requests, or requests from other control plane protocols. Traffic that is traversing the device through the data plane is not affected. A reload of the device is required to restore control plane services.
Vulnerability class: Integer Overflow
EPSS: 0.003 (17.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Cisco Ios Xe Software — versions 16.6.1, 16.6.2, 16.6.3
- Cisco Ios_xe — versions 16.6.1, 16.6.2, 16.6.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- psirt@cisco.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2024-20434?
- CVE-2024-20434 is a medium-severity vulnerability in Cisco iOS Xe Software, classified under Integer Overflow or Wraparound. CVSS score: 4.3/10. Published 2024-09-25.
- How severe is CVE-2024-20434?
- Medium severity. CVSS v3 base score is 4.3 out of 10.
- Is CVE-2024-20434 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.