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CVE-2021-34705

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
23/09/2021
Last modified:
07/02/2024

Description

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.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 5.30 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): Low
Availability (A): None

Base Score 3.x
5.30
Severity 3.x
MEDIUM
Vector 2.0
AV:N/AC:M/Au:N/C:N/I:P/A:N CVSS v2.0 Severity and Metrics:

Base Score: 4.30 MEDIUM
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): None
Integrity (I): Physical
Availability (A): None

Base Score 2.0
4.30
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:cisco:ios:12.3\(7\)xm:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(7\)xr:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(7\)xr1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(7\)xr2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(7\)xr3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(7\)xr4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(7\)xr5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(7\)xr6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(7\)xr7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(8\)ja2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(8\)jea1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(8\)jea2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(8\)jea3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(8\)jeb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(8\)jeb1:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools