Denial of service in Cisco IOS XE Software

1) Resource exhaustion

EUVDB-ID: #VU62337

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-20692

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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 NETCONF over SSH feature. A remote user can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XE: 16.12.1

Catalyst 3850 Series Switches: All versions

Catalyst 9200 Series Switches: All versions

Catalyst 9300 Series Switches: All versions

Catalyst 9400 Series Switches: All versions

Catalyst 9500 Series Switches: All versions

Catalyst 9500H Series Switches: All versions

Catalyst 9600 Series Switches: All versions

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_ios_xe:16.12.1:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:catalyst_3850_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:catalyst_9200_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:catalyst_9300_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:catalyst_9400_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:catalyst_9500_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:catalyst_9500h_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:catalyst_9600_series_switches:*:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ncossh-dos-ZAkfOdq8

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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