Denial of service in Cisco IOS and Cisco IOS XE

1) State Issues

EUVDB-ID: #VU68873

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-2020-3200

CWE-ID: CWE-371 - State Issues

Exploit availability: No

Description

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

The vulnerability exists due to an internal state not being represented correctly in the Secure Shell (SSH) server. A remote user can create an SSH connection to an affected device and cause a denial of service condition.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS: 16.5.1

Cisco IOS XE: 16.5(1)

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_ios:16.5.1:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xe:16.5(1):*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ssh-dos-Un22sd2A

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.