Vulnerability identifier: #VU51707

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1403

CWE-ID: CWE-345

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco ASR 1000 Series Aggregation Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cloud Services Router 1000V Series
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 2600 Series Multiservice Platforms
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 3850 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 3650 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 4000 Series Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 1000 Series Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9300 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9500 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9400 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 1100 Series Industrial Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9200 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Embedded Services 3300 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst IE3200 Rugged Series
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst IE3300 Rugged Series
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst IE3400 Rugged Series
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9600 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9800 Series Wireless Controllers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst IE3400 Heavy Duty Series
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Cloud Services Router 1000V Series
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 denial of service (DoS) attack.

The vulnerability exists in the web UI feature of Cisco IOS XE Software. A remote attacker can conduct a cross-site WebSocket hijacking (CSWSH) attack and cause denial of service.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco ASR 1000 Series Aggregation Services Routers: All versions

Cloud Services Router 1000V Series: All versions

Cisco 2600 Series Multiservice Platforms: All versions

Cisco Catalyst 3850 Series Switches: All versions

Cisco Catalyst 3650 Series Switches: All versions

Cisco 4000 Series Integrated Services Routers: All versions

Cisco 1000 Series Integrated Services Routers: All versions

Cisco Catalyst 9300 Series Switches: All versions

Cisco Catalyst 9500 Series Switches: All versions

Cisco Catalyst 9400 Series Switches: All versions

Cisco 1100 Series Industrial Integrated Services Routers: All versions

Cisco Catalyst 9200 Series Switches: All versions

Cisco Embedded Services 3300 Series Switches: All versions

Cisco Catalyst IE3200 Rugged Series: All versions

Cisco Catalyst IE3300 Rugged Series: All versions

Cisco Catalyst IE3400 Rugged Series: All versions

Cisco Catalyst 9600 Series Switches: All versions

Cisco Catalyst 9800 Series Wireless Controllers: All versions

Cisco Catalyst IE3400 Heavy Duty Series: All versions

Cisco Cloud Services Router 1000V Series: All versions

Cisco IOS XE: 17.2.1

---

External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-cswsh-FKk9AzT5
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvu98441

---

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.