SB2021092412 - Protection Mechanism Failure in Cisco IOS XE Software
Published: September 24, 2021
Security Bulletin ID
SB2021092412
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Protection Mechanism Failure (CVE-ID: CVE-2021-1616)
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 update from vendor's website.