rpc.mountd in nfs-utils after 1.0.3 and before 1.0.6 allows attackers to cause a denial of service (crash) via an NFS mount of a directory from a client whose reverse DNS lookup name is different from the forward lookup name.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9673
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A861
https://exchange.xforce.ibmcloud.com/vulnerabilities/15418
http://www.trustix.org/errata/misc/2004/TSL-2004-0009-nfs-utils.asc.txt