Resource exhaustion in Cisco ASR 1000 Series Aggregation Services Routers and Cisco IOS XE - CVE-2020-3508
Published: September 24, 2020 / Updated: October 1, 2020
Vulnerability identifier: #VU47235
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-3508
CWE-ID: CWE-400
Exploitation vector: Adjecent network
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 in the IP Address Resolution Protocol (ARP) feature. A remote attacker on the local network can send a malicious series of IP ARP messages, trigger resource exhaustion and perform a denial of service (DoS) attack.
Affected software
Cisco ASR 1000 Series Aggregation Services Routers
Cisco IOS XE
Cisco IOS XE
How to mitigate CVE-2020-3508
Install updates from vendor's website.
Cisco IOS XE - addressed in versions 16.1.0, 16.1.3, 16.2.2, 16.3.1a, 16.3.3a, 16.3.5c, 16.3.6, 16.3.7, 16.3.8, 16.3.10, 16.3.11, 16.6.8, 16.9.5, 16.12.3