Vulnerability identifier: #VU47234

Vulnerability risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3510

CWE-ID: CWE-388

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Catalyst 9200 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco IOS XE
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description

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

The vulnerability exists due to insufficient error handling when parsing DNS requests in the Umbrella Connector component. A remote attacker can send a series of malicious DNS requests to an Umbrella Connector client interface and cause a denial of service condition.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Catalyst 9200 Series Switches: All versions

Cisco IOS XE: 16.12.1 - 16.12.2

---

External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-umbrella-dos-t2QMUX37

---

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.