Improper access control in Cisco IOS XE - CVE-2021-1625
Published: September 24, 2021
Vulnerability identifier: #VU56874
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-1625
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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).
Affected software
Cisco IOS XE
How to mitigate CVE-2021-1625
Install updates from vendor's website.
Cisco IOS XE - addressed in versions 17.2.3, 17.3.3, 17.3.4a, 17.4.1b, 17.4.2, 17.5.1a, 17.6.1a