The MITRE CVE dictionary describes this issue as:
The RFC 5011 implementation in rdata.c in ISC BIND 9.7.x and 9.8.x before 9.8.5-P2, 9.8.6b1, 9.9.x before 9.9.3-P2, and 9.9.4b1, and DNSco BIND 9.9.3-S1 before 9.9.3-S1-P1 and 9.9.4-S1b1, allows remote attackers to cause a denial of service (assertion failure and named daemon exit) via a query with a malformed RDATA section that is not properly handled during construction of a log message, as exploited in the wild in July 2013.
Find out more about CVE-2013-4854 from the
MITRE CVE dictionary dictionary and
This issue did not affect the versions of bind as shipped with Red Hat Enterprise Linux 5. It does affect the versions of bind97 as shipped with Red Hat Enterprise Linux 5 and the versions of bind as shipped with Red Hat Enterprise Linux 6.