SB2021092313 - Denial of service in Cisco IOS and IOS XE Software
Published: September 23, 2021
Security Bulletin ID
SB2021092313
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2021-1620)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to the code does not release the allocated IP address under certain failure conditions in the Internet Key Exchange Version 2 (IKEv2) support for the AutoReconnect feature. A remote authenticated attacker can try to connect to the device with a non-AnyConnect client and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.