Vulnerability identifier: #VU51708

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1352

CWE-ID: CWE-823

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Cisco 2600 Series Multiservice Platforms
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco ASR 1000 Series Aggregation Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Cloud Services Router 1000V Series
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 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 improper input validation within the DECnet Phase IV and DECnet/OSI protocol. A remote attacker on the local network can send specially crafted DECnet traffic to the affected device and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco 2600 Series Multiservice Platforms: All versions

Cisco ASR 1000 Series Aggregation Services Routers: All versions

Cisco Cloud Services Router 1000V Series: 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 IOS XE: 16.12

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-decnet-dos-cuPWDkyL
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv51476

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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