A vulnerability in the Voice Telephony Service Provider (VTSP) service of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass configured destination patterns and dial arbitrary numbers. This vulnerability is due to insufficient validation of dial strings at Foreign Exchange Office (FXO) interfaces. An attacker could exploit this vulnerability by sending a malformed dial string to an affected device via either the ISDN protocol or SIP. A successful exploit could allow the attacker to conduct toll fraud, resulting in unexpected financial impact to affected customers.
References
Configurations
Configuration 1 (hide)
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History
30 Oct 2025, 21:14
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:cisco:ios_xe:-:*:*:*:*:*:*:* |
Information
Published : 2021-09-23 03:15
Updated : 2025-10-30 21:14
NVD link : CVE-2021-34705
Mitre link : CVE-2021-34705
CVE.ORG link : CVE-2021-34705
JSON object : View
Products Affected
cisco
- ios_xe
- ios
CWE