The DNS server for Cisco Content Service Switch (CSS) 11000 and 11500, when prompted for a nonexistent AAAA record, responds with response code 3 (NXDOMAIN or "Name Error") instead of response code 0 ("No Error"), which allows remote attackers to cause a denial of service (inaccessible domain) by forcing other DNS servers to send and cache a request for a AAAA record to the vulnerable server.

References

• https://nvd.nist.gov/vuln/detail/CVE-2003-1132
• http://www.cisco.com/warp/public/707/cisco-sa-20030430-dns.shtml
• http://www.kb.cert.org/vuls/id/714121