Denial of service in Cisco IOS XE Software

Published: 2020-10-01
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-3422
Exploitation vector Network
Public exploit N/A
Vulnerable software
Cisco IOS XE
Operating systems & Components / Operating system

Vendor Cisco Systems, Inc

Security Advisory

This security advisory describes one medium risk vulnerability.

1) State Issues

Risk: Medium

CVSSv3: 7.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-3422

CWE-ID: CWE-371 - State Issues

Exploit availability: No


The vulnerability allows a remote attacker to perofrm a denial of service (DoS) attack.

The vulnerability exists due to the IP Service Level Agreement (SLA) responder feature could consume a port that could be used by another feature. A remote attacker can send specific IP SLA control packets and cause an in-use port to be consumed by the IP SLA responder, resulting in a denial of service condition. 


Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XE: 16.9.3

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.