Protection Mechanism Failure in Cisco IOS XE - CVE-2021-1616
Published: September 24, 2021
Vulnerability identifier: #VU56860
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-1616
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Cisco IOS XE
Cisco IOS XE
Software vendor:
Cisco Systems, Inc
Cisco Systems, Inc
Description
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures in the H.323 application level gateway (ALG) used by the Network Address Translation (NAT) feature. A remote attacker can send a specially crafted traffic, bypass the ALG and open connections that should not be allowed to a remote device located behind the ALG
Remediation
Install updates from vendor's website.