Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2021-34705 |
CWE-ID | CWE-254 |
Exploitation vector | Network |
Public exploit | N/A |
Vulnerable software Subscribe |
Cisco IOS Operating systems & Components / Operating system Cisco IOS XE Operating systems & Components / Operating system |
Vendor | Cisco Systems, Inc |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU56841
Risk: Medium
CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-34705
CWE-ID:
CWE-254 - Security Features
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsCisco IOS: 15.1(4)M
Cisco IOS XE: 15.1(4)M
External linksQ & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.