#VU54173 Improper Authentication in Cisco Small Business 220 Series Smart Switches - CVE-2021-1542

Vulnerability identifier: #VU54173

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-1542

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Small Business 220 Series Smart Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to usage of weak sessionidentifiers. A remote unauthenticated attacker can guess active session identifier, bypass authentication process and gain unauthorized access to the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Small Business 220 Series Smart Switches: before 1.2.0.6

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ciscosb-multivulns-Wwyb7s5E
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvx57925

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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 Internet.

Is there known malware, which exploits this vulnerability?

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