#VU68873 State Issues in Cisco IOS and Cisco IOS XE - CVE-2020-3200

Vulnerability identifier: #VU68873

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco IOS
Operating systems & Components / Operating system
Cisco IOS XE
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

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)

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

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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.