5.3
CVE-2021-34705
- EPSS 1.01%
- Veröffentlicht 23.09.2021 03:15:17
- Zuletzt bearbeitet 30.10.2025 21:14:55
- Erkennungen
LoginCisco IOS and IOS XE Software FXO Interface Destination Pattern Bypass Vulnerability
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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
| Typ | Quelle | Score | Percentile |
|---|---|---|---|
| EPSS | FIRST.org | 1.01% | 0.591 |
| Quelle | Base Score | Exploit Score | Impact Score | Vector String |
|---|---|---|---|---|
| NIST | 5.3 | 3.9 | 1.4 |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
|
| NIST | 4.3 | 8.6 | 2.9 |
AV:N/AC:M/Au:N/C:N/I:P/A:N
|
| Cisco PSIRT | 5.3 | 3.9 | 1.4 |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
|
CWE-232 Improper Handling of Undefined Values
The product does not handle or incorrectly handles when a value is not defined or supported for the associated parameter, field, or argument name.
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxo-pattern-bypass-jUXgygYv