Vulnerability in Cisco Cbr-8
CVE-2020-3509
A vulnerability in the DHCP message handler of Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers could allow an unauthenticated, remote attacker to cause the supervisor to crash, which could result in a denial of service (DoS) condition. The vulnerability is due to insufficient error handling when DHCP version 4 (DHCPv4) messages are parsed. An attacker could exploit this vulnerability by sending a malicious DHCPv4 message to or through a WAN interface of an affected device. A successful exploit could allow the attacker to cause a reload of the affected device. Note: On Cisco cBR-8 Converged Broadband Routers, all of the following are considered WAN interfaces: 10 Gbps Ethernet interfaces 100 Gbps Ethernet interfaces Port channel interfaces that include multiple 10 and/or 100 Gbps Ethernet interfaces
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.014 (72.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
- Cisco Cbr-8
- Cisco iOS Xe Software
- Cisco iOS Xe — versions 16.7\(1\), 16.7(1)
Weakness classification (CWE)
References
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-dh… (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-3509?
- CVE-2020-3509 is a high-severity vulnerability in Cisco Cbr-8, classified under CWE-388. CVSS score: 8.6/10. Published 2020-09-24.
- How severe is CVE-2020-3509?
- High severity. CVSS v3 base score is 8.6 out of 10.