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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published: 2021-09-23T02:26:09.005050Z

Updated: 2024-09-16T18:33:27.582Z

Reserved: 2021-06-15T00:00:00

Link: CVE-2021-34705

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2021-09-23T03:15:17.240

Modified: 2024-02-07T18:29:23.587

Link: CVE-2021-34705

cve-icon Redhat

No data.