CVE-2012-0339: Cisco IOS

Medium severity, CVSS 5.0. EPSS: 1% chance of exploitation in the next 30 days.

Cisco IOS 12.2 through 12.4 and 15.0 does not recognize the vrf-also keyword during enforcement of access-class commands, which allows remote attackers to establish TELNET connections from arbitrary source IP addresses via a standard TELNET client, aka Bug ID CSCsi77774.

Affected products

• Cisco IOS: version 12.2 only; version 12.3 only; version 12.4 only; version 15.0 only

Published 2012-05-02. Last modified 2026-06-16.