CVE-2021-34705 — Improper Handling of Undefined Values in Cisco IOS

CWE-232 — Improper Handling of Undefined Values4 documents4 sources

Severity

5.3MEDIUMNVD

EPSS

0.6%

top 31.96%

CISA KEV

Not in KEV

Exploit

No known exploits

Affected products

Cisco IOS Cisco IOS Cisco IOS XE

Timeline

PublishedSep 23

Latest updateMay 24

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 successf…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NExploitability: 3.9 | Impact: 1.4

Affected Packages3 packages

▶NVDcisco/ios1439 versions+1438

▶NVDcisco/ios_xe281 versions+280

▶CVEListV5cisco/cisco_iosn/a

🔴Vulnerability Details

GHSA

GHSA-xxj5-mhw2-jgp8: A vulnerability in the Voice Telephony Service Provider (VTSP) service of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated,↗2022-05-24

▶

CVEList

Cisco IOS and IOS XE Software FXO Interface Destination Pattern Bypass Vulnerability↗2021-09-23

▶

📋Vendor Advisories

Cisco

Cisco IOS and IOS XE Software FXO Interface Destination Pattern Bypass Vulnerability↗2021-09-22

▶