The nss_dns implementation of getnetbyname in GNU C Library (aka glibc) before 2.21, when the DNS backend in the Name Service Switch configuration is enabled, allows remote attackers to cause a denial of service (infinite loop) by sending a positive answer while a network name is being process.
Exploitability
AV:NAC:LAu:NImpact
C:NI:NA:C7.8/AV:N/AC:L/Au:N/C:N/I:N/A:C