Vulnerability identifier: #VU57958

Vulnerability risk: High

CVSSv3.1: 7.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-34739

CWE-ID: CWE-613

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco 250 Series Smart Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 350 Series Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 350X Series Stackable Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 550X Series Stackable Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco ESW2 Series Advanced Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Small Business 200 Series Smart Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Small Business 300 Series Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Small Business 500 Series Stackable Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to insufficient expiration of session credentials. A remote non-authenticated attacker can obtain or guess session token, gain unauthorized access to session that belongs to another user and access the web-based management interface with administrator privileges.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Cisco 250 Series Smart Switches: All versions

Cisco 350 Series Managed Switches: All versions

Cisco 350X Series Stackable Managed Switches: All versions

Cisco 550X Series Stackable Managed Switches: All versions

Cisco ESW2 Series Advanced Switches: All versions

Cisco Small Business 200 Series Smart Switches: All versions

Cisco Small Business 300 Series Managed Switches: All versions

Cisco Small Business 500 Series Stackable Managed Switches: All versions

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-smb-switches-tokens-UzwpR4e5

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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.