PT-2020-17254 · Cisco · Cisco Ios Xe

Published 2020-09-24 · Updated 2020-10-08 · CVE-2020-3509

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers (affected versions not specified)

Description A vulnerability in the DHCP message handler could allow an unauthenticated, remote attacker to cause the supervisor to crash, resulting in a denial of service (DoS) condition. This is due to insufficient error handling when DHCP version 4 (DHCPv4) messages are parsed. An attacker could exploit this by sending a malicious DHCPv4 message to or through a WAN interface of an affected device, potentially causing a reload of the device. WAN interfaces include 10 Gbps Ethernet interfaces, 100 Gbps Ethernet interfaces, and port channel interfaces with multiple 10 and/or 100 Gbps Ethernet interfaces.

Recommendations Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Fix

DoS

Side Channel Attack

Weakness Enumeration

CWE-388

CWE-203

Related Identifiers

CVE-2020-3509

Affected Products

Cisco Ios Xe

References · 5

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-dhcp-dos-JSCKX43h · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-3509 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-3509 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-dhcp-dos-JSCKX43h · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/657130 · Security Note