Improper access control in Cisco IOS XE Software



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-1625
CWE-ID CWE-284
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Cisco IOS XE
Operating systems & Components / Operating system

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper access control

EUVDB-ID: #VU56874

Risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1625

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in the Zone-Based Policy Firewall feature. A remote attacker can send UDP or ICMP flows to inject traffic through the Zone-Based Policy Firewall, leading to traffic being dropped because it is incorrectly classified or incorrect reporting figures being produced by high-speed logging (HSL).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XE: 17.3.1

CPE2.3 External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-zbfw-pP9jfzwL


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.



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