CVE-2021-34705
Cisco IOS and IOS XE Software FXO Interface Destination Pattern Bypass Vulnerability
MEDIUM
5.3
CVSS Score
Published: September 23, 2021 at 02:26 AM UTC
Updated: June 17, 2026 at 03:56 AM UTC
2 products affected across 1 vendorIOSIOS Xe
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Severity
MEDIUM5.3
Exploit prediction
EPSS 1%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
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16.1.116.1.216.1.316.10.116.10.1a16.10.1b16.10.1c16.10.1d16.10.1e16.10.1f16.10.1g16.10.1s16.10.216.10.316.11.116.11.1a16.11.1b16.11.1c16.11.1s16.11.216.12.116.12.1a16.12.1c16.12.1s16.12.1t16.12.1w16.12.1x16.12.1y16.12.1z16.12.1z116.12.1za16.12.216.12.2a16.12.2s16.12.2t16.12.316.12.3a16.12.3s16.12.416.12.4a16.12.516.12.5a16.12.5b16.2.116.2.216.3.116.3.1016.3.1116.3.1a16.3.216.3.316.3.416.3.516.3.5b16.3.616.3.716.3.816.3.916.4.116.4.216.4.316.5.116.5.1a16.5.1b16.5.216.5.316.6.116.6.216.6.316.6.416.6.4a16.6.4s16.6.516.6.5a16.6.5b16.6.616.6.716.6.7a16.6.816.7.116.7.1a16.7.1b16.7.216.7.316.7.416.8.116.8.1a16.8.1b16.8.1c16.8.1d16.8.1e16.8.1s16.8.216.8.316.9.116.9.1a16.9.1b16.9.1c16.9.1d16.9.1s16.9.216.9.2a16.9.2s16.9.316.9.3a16.9.3h16.9.3s16.9.416.9.4c16.9.516.9.5f16.9.617.1.117.1.1a17.1.1s17.1.1t17.1.217.1.317.2.117.2.1a17.2.1r17.2.1v17.2.217.2.317.3.117.3.1a17.3.1w17.3.1x17.3.1z17.3.217.3.2a17.4.117.4.1a17.4.1b17.4.1c3.10.0s3.10.10s3.10.1s3.10.1xbs3.10.1xcs3.10.2as3.10.2s3.10.2ts3.10.3s3.10.4s3.10.5s3.10.6s3.10.7s3.10.8as3.10.8s3.10.9s3.11.0s3.11.1s3.11.2s3.11.3s3.11.4s3.12.0as3.12.0s3.12.1s3.12.2s3.12.3s3.12.4s3.13.0as3.13.0s3.13.10s3.13.1s3.13.2as3.13.2s3.13.3s3.13.4s3.13.5as3.13.5s3.13.6as3.13.6bs3.13.6s3.13.7as3.13.7s3.13.8s3.13.9s3.14.0s3.14.1s3.14.2s3.14.3s3.14.4s3.15.0s3.15.1cs3.15.1s3.15.1xbs3.15.2s3.15.2xbs3.15.3s3.15.4s3.16.0as3.16.0bs3.16.0cs3.16.0s3.16.10as3.16.10bs3.16.10cs3.16.10s3.16.1as3.16.1s3.16.2as3.16.2bs3.16.2s3.16.3as3.16.3s3.16.4as3.16.4bs3.16.4cs3.16.4ds3.16.4es3.16.4gs3.16.4s3.16.5as3.16.5bs3.16.5s3.16.6bs3.16.6s3.16.7as3.16.7bs3.16.7s3.16.8s3.16.9s3.17.0s3.17.1as3.17.1s3.17.2s3.17.3s3.17.4s3.18.0as3.18.0s3.18.0sp3.18.10sp3.18.1asp3.18.1bsp3.18.1csp3.18.1gsp3.18.1hsp3.18.1isp3.18.1s3.18.1sp3.18.2asp3.18.2s3.18.2sp3.18.3asp3.18.3bsp3.18.3s3.18.3sp3.18.4s3.18.4sp3.18.5sp3.18.6sp3.18.7sp3.18.8asp3.18.8sp3.18.9sp3.7.0bs3.7.0s3.7.0xas3.7.0xbs3.7.1as3.7.1s3.7.2s3.7.2ts3.7.3s3.7.4as3.7.4s3.7.5s3.7.6s3.7.7s3.7.8s3.8.0s3.8.1s3.8.2s3.9.0as3.9.0s3.9.0xas3.9.1as3.9.1s3.9.2s
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor Advisoryx_refsource_CISCO
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxo-pattern-bypass-jUXgygYvCVSS
5.3MEDIUMcisco
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusANALYZED
CWE
CWE-232NVD-CWE-Other
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