SB2021092312 - Security features bypass in Cisco IOS and IOS XE Software
Published: September 23, 2021
Security Bulletin ID
SB2021092312
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) Security features bypass (CVE-ID: CVE-2021-34705)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to insufficient validation of dial strings at Foreign Exchange Office (FXO) interfaces in the Voice Telephony Service Provider (VTSP) service. A remote attacker can send a specially crafted dial string and conduct toll fraud, resulting in unexpected financial impact to affected customers.
Remediation
Install update from vendor's website.