Cisco IOS before 15.3(1)T, when media flow-around is not used, allows remote attackers to cause a denial of service (media loops and stack memory corruption) via VoIP traffic, aka Bug ID CSCub45809.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-5044
Reference (s):
- http://www.cisco.com/c/en/us/td/docs/ios/15_3m_and_t/release/notes/15_3m_and_t.pdf