Resource exhaustion in Cisco Systems, Inc products - CVE-2020-3338
Published: August 27, 2020
Vulnerability identifier: #VU46105
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-3338
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources when processing inbound PIM6 packets. A remote attacker can send multiple specially crafted PIM6 packets, trigger resource exhaustion and perform a denial of service (DoS) attack.
Affected software
Cisco NX-OS
Cisco Nexus 9000 Series Switches NX-OS Mode
Cisco Nexus 7000 Series Switches
Cisco Nexus 3000 Series Switches
Cisco Nexus 9000 Series Switches NX-OS Mode
Cisco Nexus 7000 Series Switches
Cisco Nexus 3000 Series Switches
How to mitigate CVE-2020-3338
Install updates from vendor's website.
Cisco NX-OS - update to 9.3.3
Cisco Nexus 9000 Series Switches NX-OS Mode - update to 9.3.3
Cisco Nexus 7000 Series Switches - addressed in versions 7.3.6 D1.1, 8.2.6, 8.4.1, 8.4.2
Cisco Nexus 3000 Series Switches - update to 9.3.3
Cisco Nexus 9000 Series Switches NX-OS Mode - update to 9.3.3
Cisco Nexus 7000 Series Switches - addressed in versions 7.3.6 D1.1, 8.2.6, 8.4.1, 8.4.2
Cisco Nexus 3000 Series Switches - update to 9.3.3